Directional Distributional Similarity for Lexical Expansion Lili Kotlerman author Ido Dagan author Idan Szpektor author Maayan Zhitomirsky-Geffet author 2009-08 text Proceedings of the ACL-IJCNLP 2009 Conference Short Papers Keh-Yih Su editor Jian Su editor Janyce Wiebe editor Haizhou Li editor Association for Computational Linguistics Suntec, Singapore conference publication kotlerman-etal-2009-directional https://aclanthology.org/P09-2018/ 2009-08 69 72