Detecting Subgroups in Online Discussions by Modeling Positive and Negative Relations among Participants Ahmed Hassan author Amjad Abu-Jbara author Dragomir Radev author 2012-07 text Proceedings of the 2012 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning Jun’ichi Tsujii editor James Henderson editor Marius Paşca editor Association for Computational Linguistics Jeju Island, Korea conference publication hassan-etal-2012-detecting https://aclanthology.org/D12-1006/ 2012-07 59 70