Opinion Retrieval Systems using Tweet-external Factors Yoon-Sung Kim author Young-In Song author Hae-Chang Rim author 2016-12 text Proceedings of COLING 2016, the 26th International Conference on Computational Linguistics: System Demonstrations Hideo Watanabe editor The COLING 2016 Organizing Committee Osaka, Japan conference publication kim-etal-2016-opinion https://aclanthology.org/C16-2027/ 2016-12 126 130