Extracting Hierarchical Rules from a Weighted Alignment Matrix Zhaopeng Tu author Yang Liu author Qun Liu author Shouxun Lin author 2011-11 text Proceedings of 5th International Joint Conference on Natural Language Processing Haifeng Wang editor David Yarowsky editor Asian Federation of Natural Language Processing Chiang Mai, Thailand conference publication tu-etal-2011-extracting https://aclanthology.org/I11-1145/ 2011-11 1294 1303