Extended Tree Transducers in Natural Language Processing Andreas Maletti author 2015 text Proceedings of the 12th International Conference on Finite-State Methods and Natural Language Processing 2015 (FSMNLP 2015 Düsseldorf) Thomas Hanneforth editor Christian Wurm editor Association for Computational Linguistics conference publication maletti-2015-extended https://aclanthology.org/W15-4801/ 2015