Finding Optimal 1-Endpoint-Crossing Trees Emily Pitler author Sampath Kannan author Mitchell Marcus author 2013 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal pitler-etal-2013-finding 10.1162/tacl_a_00206 https://aclanthology.org/Q13-1002/ 2013 1 13 24