Well-Nested Parallelism Constraints for Ellipsis Resolution Katrin Erk author Joachim Niehren author 2003-04 text 10th Conference of the European Chapter of the Association for Computational Linguistics Ann Copestake editor Jan Hajič editor Association for Computational Linguistics Budapest, Hungary conference publication erk-niehren-2003-well https://aclanthology.org/E03-1027/ 2003-04