Using Shallow Semantic Parsing and Relation Extraction for Finding Contradiction in Text Minh Quang Nhat Pham author Minh Le Nguyen author Akira Shimazu author 2013-10 text Proceedings of the Sixth International Joint Conference on Natural Language Processing Ruslan Mitkov editor Jong C Park editor Asian Federation of Natural Language Processing Nagoya, Japan conference publication pham-etal-2013-using https://aclanthology.org/I13-1138/ 2013-10 1017 1021