Sisay Fissaha Daniel Olejnik Ralf Kornberger Karin Müller Detlef Prescher Experiments in German Treebank Parsing. 50-57 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2807&spage=50 2003 conf/tsd/2003 TSD db/conf/tsd/tsd2003.html#FissahaOKMP03