Fernando Esponda Stephanie Forrest Paul Helman The Crossover Closure and Partial Match Detection. 249-260 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2787&spage=249 2003 conf/icaris/2003 ICARIS db/conf/icaris/icaris2003.html#EspondaFH03