Gathering and Generating Paraphrases from Twitter with Application to Normalization Wei Xu author Alan Ritter author Ralph Grishman author 2013-08 text Proceedings of the Sixth Workshop on Building and Using Comparable Corpora Serge Sharoff editor Pierre Zweigenbaum editor Reinhard Rapp editor Association for Computational Linguistics Sofia, Bulgaria conference publication xu-etal-2013-gathering https://aclanthology.org/W13-2515/ 2013-08 121 128