Combining Lexical Resources for Contextual Synonym Expansion Ravi Sinha author Rada Mihalcea author 2009-09 text Proceedings of the International Conference RANLP-2009 Galia Angelova editor Ruslan Mitkov editor Association for Computational Linguistics Borovets, Bulgaria conference publication sinha-mihalcea-2009-combining https://aclanthology.org/R09-1073/ 2009-09 404 410