Engkoo: Mining the Web for Language Learning Matthew R Scott author Xiaohua Liu author Ming Zhou author Microsoft Engkoo Team author 2011-06 text Proceedings of the ACL-HLT 2011 System Demonstrations Sadao Kurohashi editor Association for Computational Linguistics Portland, Oregon conference publication scott-etal-2011-engkoo https://aclanthology.org/P11-4008/ 2011-06 44 49