Learning Structural Kernels for Natural Language Processing Daniel Beck author Trevor Cohn author Christian Hardmeier author Lucia Specia author 2015 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal beck-etal-2015-learning 10.1162/tacl_a_00151 https://aclanthology.org/Q15-1033/ 2015 3 461 473