J. Esparza and M. Silva. On the analysis und synthesis of free choice systems. In G Rozenberg., editor, Advances in Petri Nets 1990, number 483 in Lecture Notes in Computer Science, pages 243–286, 1990.	PDF (4 MB) Info
J. Esparza and M. Silva. Circuits, handles, bridges and nets. In G. Rozenberg, editor, Advances in Petri Nets 1990, number 483 in Lecture Notes in Computer Science, pages 210–242, 1990.	PDF (4 MB) Info
J. Esparza. Synthesis rules for Petri nets, und how they lead to new results. In J.C.M. Baeten und J.W. Klop, editor, Proceedings of CONCUR '90, number 458 in Lecture Notes in Computer Science, pages 182–198, 1990.	PDF (1 MB) Info