Cause-Effect Relation Learning Zornitsa Kozareva author 2012-07 text Workshop Proceedings of TextGraphs-7: Graph-based Methods for Natural Language Processing Irina Matveeva editor Ahmed Hassan editor Gael Dias editor Association for Computational Linguistics Jeju, Republic of Korea conference publication kozareva-2012-cause https://aclanthology.org/W12-4107/ 2012-07 39 43