CCGbank: A Corpus of CCG Derivations and Dependency Structures Extracted from the Penn Treebank Julia Hockenmaier author Mark Steedman author 2007 text journal article Computational Linguistics continuing periodical academic journal hockenmaier-steedman-2007-ccgbank 10.1162/coli.2007.33.3.355 https://aclanthology.org/J07-3004/ 2007 33 3 355 396