Anilda Qemali Gabriele Taentzer Towards Validation of Session Management in Web Applications based on Graph Transformation. 15-29 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3062&spage=15 2003 conf/agtive/2003 AGTIVE db/conf/agtive/agtive2003.html#QemaliT03