UCD-PN: Selecting General Paraphrases Using Conditional Probability Paul Nulty author Fintan Costello author 2010-07 text Proceedings of the 5th International Workshop on Semantic Evaluation Katrin Erk editor Carlo Strapparava editor Association for Computational Linguistics Uppsala, Sweden conference publication nulty-costello-2010-ucd https://aclanthology.org/S10-1052/ 2010-07 234 237