The Complexity of Phrase Alignment Problems John DeNero author Dan Klein author 2008-06 text Proceedings of ACL-08: HLT, Short Papers Johanna D Moore editor Simone Teufel editor James Allan editor Sadaoki Furui editor Association for Computational Linguistics Columbus, Ohio conference publication denero-klein-2008-complexity https://aclanthology.org/P08-2007/ 2008-06 25 28