Sentiment Analysis of Citations using Sentence Structure-Based Features Awais Athar author 2011-06 text Proceedings of the ACL 2011 Student Session Sasa Petrovic editor Ethan Selfridge editor Emily Pitler editor Miles Osborne editor Thamar Solorio editor Association for Computational Linguistics Portland, OR, USA conference publication athar-2011-sentiment https://aclanthology.org/P11-3015/ 2011-06 81 87