1. APNN-Toolbox (March 18, 2002), http://ls4-www.cs.uni-dortmund.de/APNN-TOLBOX/
2. Bause, F., Kemper, P., Kritzinger, P.: Abstract Petri net notation. Petri Net Newsletter 49, 9–27 (1995)
3. CPN-AMI (March 18, 2002), http://www-src.lip6.fr/logiciels/mars/CPNAMI/
4. Lecture Notes in Computer Science;J. Desel,2001
5. Design/CPN (September 21, 2001), http://www.daimi.au.dk/designCPN/