Using Pivot-Based Paraphrasing and Sentiment Profiles to Improve a Subjectivity Lexicon for Essay Data Beata Beigman Klebanov author Nitin Madnani author Jill Burstein author 2013 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal beigman-klebanov-etal-2013-using 10.1162/tacl_a_00213 https://aclanthology.org/Q13-1009/ 2013 1 99 110