Peter May Keith Mander Jon Timmis Software Vaccination: An Artificial Immune System Approach to Mutation Testing. 81-92 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2787&spage=81 2003 conf/icaris/2003 ICARIS db/conf/icaris/icaris2003.html#MayMT03