Dr Sentiment Knows Everything! Amitava Das author Sivaji Bandyopadhyay author 2011-06 text Proceedings of the ACL-HLT 2011 System Demonstrations Sadao Kurohashi editor Association for Computational Linguistics Portland, Oregon conference publication das-bandyopadhyay-2011-dr https://aclanthology.org/P11-4009/ 2011-06 50 55