Evaluating Sentiment Analysis Systems in Russian Ilia Chetviorkin author Natalia Loukachevitch author 2013-08 text Proceedings of the 4th Biennial International Workshop on Balto-Slavic Natural Language Processing Jakub Piskorski editor Lidia Pivovarova editor Hristo Tanev editor Roman Yangarber editor Association for Computational Linguistics Sofia, Bulgaria conference publication chetviorkin-loukachevitch-2013-evaluating https://aclanthology.org/W13-2403/ 2013-08 12 17