Michel Diaz, Pierre Azéma. Petri net based models for the specification and validation of protocols. In Grzegorz Rozenberg, Hartmann J. Genrich, Gérard Roucairol, editors, Advances in Petri Nets 1984, European Workshop on Applications and Theory in Petri Nets, covers the last two years which include the workshop 1983 in Toulouse and the workshop 1984 in Aarhus, selected papers. Volume 188 of Lecture Notes in Computer Science, pages 101-121, Springer, 1984.