@conference {493, title = {Optimizing Planar and 2-Planar Parsers with MaltOptimizer}, booktitle = {XXVIII Congreso de la Sociedad Espa{\~n}ola para el Procesamiento del Lenguage Natural (SEPLN 2012)}, year = {2012}, attachments = {http://nil.fdi.ucm.es/sites/default/files/sepln.pdf}, author = {Miguel Ballesteros and Carlos G{\'o}mez-Rodr{\'\i}guez and Joakim Nivre} }