Kristina Toutanova Mark Mitchell Christopher D. Manning Optimizing Local Probability Models for Statistical Parsing. 409-420 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2837&spage=409 2003 conf/ecml/2003 ECML db/conf/ecml/ecml2003.html#ToutanovaMM03