1. Reliability block diagrams and Petri Net;Joller;Microelectronics & Reliability,1980
2. Communication with Automata;Petri,1962
3. Final report of the information system theory project;Holt;Rome Air Development Centre, No. AD676-972,1978
4. Some applications of Petri Nets;Agerwala,1978
5. Interpretation of net theory;Petri,1975