Investigation of Unsupervised Pattern Learning Techniques for Bootstrap Construction of a Medical Treatment Lexicon Rong Xu author Alexander A Morgan author Amar Das author Alan Garber author 2009-06 text Proceedings of the BioNLP 2009 Workshop K Bretonnel Cohen editor Dina Demner-Fushman editor Sophia Ananiadou editor John Pestian editor Jun’ichi Tsujii editor Bonnie Webber editor Association for Computational Linguistics Boulder, Colorado conference publication xu-etal-2009-investigation https://aclanthology.org/W09-1308/ 2009-06 63 70