JENSEN, K. Coloured Petri Nets and the Invariant-Method. DAIMI Report Series, [S. l.], v. 8, n. 104, 1983. DOI: 10.7146/dpb.v8i104.6519. Disponível em: https://tidsskrift.dk/daimipb/article/view/6519. Acesso em: 8 may. 2024.