The Computation of Movement

The Computation of Movement Sandiway Fong author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication fong-1997-computation https://aclanthology.org/1997.iwpt-1.1/ 1997-sep 17-20 xiii xiv Parsing Technology and RNA Folding: a Promising Start Fabrice Lefebvre author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication lefebvre-1997-parsing https://aclanthology.org/1997.iwpt-1.2/ 1997-sep 17-20 xv xvi Intelligent Multimedia Information Access Mark T Maybury author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication maybury-1997-intelligent https://aclanthology.org/1997.iwpt-1.3/ 1997-sep 17-20 xvii xviii Making Use of Intonation in Interactive Dialogue Translation Mark Steedman author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication steedman-1997-making https://aclanthology.org/1997.iwpt-1.4/ 1997-sep 17-20 xix Disambiguating with Controlled Disjunctions Philippe Blache author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication blache-1997-disambiguating https://aclanthology.org/1997.iwpt-1.5/ 1997-sep 17-20 1 7 Encoding Frequency Information in Lexicalized Grammars John Carroll author David Weir author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication carroll-weir-1997-encoding https://aclanthology.org/1997.iwpt-1.6/ 1997-sep 17-20 8 17 Towards a Reduced Commitment, D-Theory Style TAG Parser John Chen author K Vijay-Shankar author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication chen-vijay-shankar-1997-towards https://aclanthology.org/1997.iwpt-1.7/ 1997-sep 17-20 18 29 Controlling Bottom-Up Chart Parsers through Text Chunking Fabio Ciravegna author Alberto Lavelli author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication ciravegna-lavelli-1997-controlling https://aclanthology.org/1997.iwpt-1.8/ 1997-sep 17-20 30 41 Pruning Search Space for Parsing Free Coordination in Categorial Grammar Crit Cremers author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication cremers-1997-pruning https://aclanthology.org/1997.iwpt-1.9/ 1997-sep 17-20 42 53 Bilexical Grammars and a Cubic-time Probabilistic Parser Jason Eisner author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication eisner-1997-bilexical https://aclanthology.org/1997.iwpt-1.10/ 1997-sep 17-20 54 65 Automaton-based Parsing for Lexicalised Grammars Roger Evans author David Weir author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication evans-weir-1997-automaton https://aclanthology.org/1997.iwpt-1.11/ 1997-sep 17-20 66 76 From Part of Speech Tagging to Memory-based Deep Syntactic Analysis Emmanuel Giguet author Jacques Vergne author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication giguet-vergne-1997-part https://aclanthology.org/1997.iwpt-1.12/ 1997-sep 17-20 77 88 Probabilistic Feature Grammars Joshua Goodman author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication goodman-1997-probabilistic https://aclanthology.org/1997.iwpt-1.13/ 1997-sep 17-20 89 100 Message-passing Protocols for Real-world Parsing - An Object-oriented Model and its Preliminary Evaluation Udo Hahn author Peter Neuhaus author Norbert Broeker author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication hahn-etal-1997-message https://aclanthology.org/1997.iwpt-1.14/ 1997-sep 17-20 101 112 Probabilistic Parse Selection based on Semantic Cooccurrences Eirik Hektoen author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication hektoen-1997-probabilistic https://aclanthology.org/1997.iwpt-1.15/ 1997-sep 17-20 113 122 A New Formalization of Probabilistic GLR Parsing Kentaro Unui author Virach Sornlertlamvanich author Hozumi Tanaka author Takenobu Tokunaga author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication unui-etal-1997-new https://aclanthology.org/1997.iwpt-1.16/ 1997-sep 17-20 123 134 Efficient Parsing for CCGs with Generalized Type-raised Categories Nobo Komagata author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication komagata-1997-efficient https://aclanthology.org/1997.iwpt-1.17/ 1997-sep 17-20 135 146 Probabilistic Parsing using Left Corner Language Models Christopher D Manning author Bob Carpenter author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication manning-carpenter-1997-probabilistic https://aclanthology.org/1997.iwpt-1.18/ 1997-sep 17-20 147 158 Regular Approximations of CFLs: A Grammatical View Mark-Jan Nederhof author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication nederhof-1997-regular https://aclanthology.org/1997.iwpt-1.19/ 1997-sep 17-20 159 170 A Left-to-right Tagger for Word Graphs Christer Samuelsson author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication samuelsson-1997-left https://aclanthology.org/1997.iwpt-1.20/ 1997-sep 17-20 171 176 Parsing by Successive Approximation Helmut Schmid author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication schmid-1997-parsing https://aclanthology.org/1997.iwpt-1.21/ 1997-sep 17-20 177 186 Performance Evaluation of Supertagging for Partial Parsing B Srinivas author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication srinivas-1997-performance https://aclanthology.org/1997.iwpt-1.22/ 1997-sep 17-20 187 198 An Earley Algorithm for Generic Attribute Augmented Grammars and Applications Frederic Tendeau author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication tendeau-1997-earley https://aclanthology.org/1997.iwpt-1.23/ 1997-sep 17-20 199 209 A Case Study in Optimizing Parsing Schemata by Disambiguation Filters Eelco Visser author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication visser-1997-case https://aclanthology.org/1997.iwpt-1.24/ 1997-sep 17-20 210 224 New Parsing Method using Global Association Table Juntae Yoon author Seonho Kim author Mansuk Song author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication yoon-etal-1997-new https://aclanthology.org/1997.iwpt-1.25/ 1997-sep 17-20 225 236 Constraint-driven Concurrent Parsing Applied to Romanian VP Liviu Ciortuz author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication ciortuz-1997-constraint https://aclanthology.org/1997.iwpt-1.26/ 1997-sep 17-20 239 240 Robustness and Efficiency in AGFL Caspar Derksen author Cornelis H A Koster author Erik Oltmans author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication derksen-etal-1997-robustness https://aclanthology.org/1997.iwpt-1.27/ 1997-sep 17-20 241 242 Language Analysis in SCHISMA Danny Lie author Joris Hulstijn author Hugo ter Doest author Anton Nijholt author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication lie-etal-1997-language https://aclanthology.org/1997.iwpt-1.28/ 1997-sep 17-20 243 244 Reducing the Complexity of Parsing by a Method of Decomposition Caroline Lyon author Bob Dickerson author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication lyon-dickerson-1997-reducing https://aclanthology.org/1997.iwpt-1.29/ 1997-sep 17-20 245 246 Formal Tools for Separating Syntactically Correct and Incorrect Structures Martin Plátek author Vladislav Kuboň author Tomáš Holan author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication platek-etal-1997-formal https://aclanthology.org/1997.iwpt-1.30/ 1997-sep 17-20 247 248 Parsers Optimization for Wide-coverage Unification-based Grammars using the Restriction Technique Nora La Serna author Arantxa Díaz author Horacio Rodríguez author 1997-sep 17-20 text Proceedings of the Fifth International Workshop on Parsing Technologies Anton Nijholt editor Robert C Berwick editor Harry C Bunt editor Bob Carpenter editor Eva Hajicova editor Mark Johnson editor Aravind Joshi editor Ronald Kaplan editor Martin Kay editor Bernard Lang editor Alon Lavie editor Makoto Nagao editor Mark Steedman editor Masaru Tomita editor K Vijay-Shanker editor David Weir editor Kent Wittenburg editor Mats Wiren editor Association for Computational Linguistics Boston/Cambridge, Massachusetts, USA conference publication la-serna-etal-1997-parsers https://aclanthology.org/1997.iwpt-1.31/ 1997-sep 17-20 249 250