Rudolf Ramler Gerald Czech Dietmar Schlosser Unit Testing beyond a Bar in Green and Red. 319-321 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2675&spage=319 2003 conf/xpu/2003 XP db/conf/xpu/xp2003.html#RamlerCS03