Markus Heller Ansgar Schleicher Bernhard Westfechtel Graph-Based Specification of a Management System for Evolving Development Processes. 334-351 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3062&spage=334 2003 conf/agtive/2003 AGTIVE db/conf/agtive/agtive2003.html#HellerSW03