Using Adaptor Grammars to Identify Synergies in the Unsupervised Acquisition of Linguistic Structure Mark Johnson author 2008-06 text Proceedings of ACL-08: HLT Johanna D Moore editor Simone Teufel editor James Allan editor Sadaoki Furui editor Association for Computational Linguistics Columbus, Ohio conference publication johnson-2008-using https://aclanthology.org/P08-1046/ 2008-06 398 406