Using Deep Linguistic Features for Finding Deceptive Opinion Spam Qiongkai Xu author Hai Zhao author 2012-12 text Proceedings of COLING 2012: Posters Martin Kay editor Christian Boitet editor The COLING 2012 Organizing Committee Mumbai, India conference publication xu-zhao-2012-using https://aclanthology.org/C12-2131/ 2012-12 1341 1350