Nondeterministic LTAG Derivation Tree Extraction Libin Shen author 2004-05 text Proceedings of the 7th International Workshop on Tree Adjoining Grammar and Related Formalisms Owen Rambow editor Matthew Stone editor Simon Fraser University Vancouver, Canada conference publication shen-2004-nondeterministic https://aclanthology.org/W04-3327/ 2004-05 199 203