Stochastic Petri nets: An elementary introduction.- Improving the efficiency of the analysis of DSPN models.- Synchronized elementary net systems.- Descriptive and analytical process algebras.- P/T-systems as abstractions of C/E-systems.- The semantics of capacities in P/T nets.- Petri net tool overview 1989.- Equivalence transformations of PrT-Nets.- A reduction theory for coloured nets.- Optimizing microprograms for recurrent loops on pipelined architectures using timed Petri nets.- S-CORT¿: A method for the development of electronic payment systems.- Timed Petri nets and application to multi-stage production systems.- Petri net systems and their closure properties.- Occam and the transputer.- About the concurrent behaviour of EN systems: Definability and closure results.- Petri nets and flexible manufacturing.- Some properties of timed nets under the earliest firing rule.- A comparative study of different techniques for semi-flows computation in place/transition nets.- Elementary net systems and dynamic logic.- Representation of a swapping class by one net.- Design methods based on nets.- CEDISYS compositional distributed systems state of the art, research goals, references.