@inproceedings{Zhu:2011:IJCNLP,
<br>&nbsp;&nbsp;&nbsp;&nbsp;  title = "Indexing Spoken Documents with Hierarchical Semantic Structures: Semantic Tree-to-string Alignment Models",
<br>&nbsp;&nbsp;&nbsp;&nbsp;  author = "Zhu, Xiaodan and Cherry, Colin and Penn, Gerald",
<br>&nbsp;&nbsp;&nbsp;&nbsp;  booktitle = "Proceedings of International Joint Conference on Natural Language Processing",
<br>&nbsp;&nbsp;&nbsp;&nbsp;  year = "2011",
<br>&nbsp;&nbsp;&nbsp;&nbsp;  location = "Chiangmai, Thailand",
<br>}