%0 Conference Proceedings %T Indexing Spoken Documents with Hierarchical Semantic Structures: Semantic Tree-to-string Alignment Models %A Zhu, Xiaodan %A Cherry, Colin %A Penn, Gerald %Y Wang, Haifeng %Y Yarowsky, David %S Proceedings of 5th International Joint Conference on Natural Language Processing %D 2011 %8 November %I Asian Federation of Natural Language Processing %C Chiang Mai, Thailand %F zhu-etal-2011-indexing %U https://aclanthology.org/I11-1057 %P 509-517