Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Kurt Lautenbach, Anastasia Pagnoni. On the various high-level Petri Nets and their invariatnts. Bulletin of the EATCS, 23:42-58, 1984.