Squibs: On the Universal Generation Problem for Unification Grammars Jürgen Wedekind author 2014-09 text journal article Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal wedekind-2014-squibs 10.1162/COLI_a_00191 https://aclanthology.org/J14-3002/ 2014-09 40 3 533 538