Parsing Noun Phrases in the Penn Treebank David Vadas author James R Curran author 2011-12 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal vadas-curran-2011-parsing 10.1162/COLI_a_00076 https://aclanthology.org/J11-4006/ 2011-12 37 4 753 809