NIELSEN, Mogens; THIAGARAJAN, P. S. Degrees of Non-determinism and Concurrency: A Petri Net View. DAIMI Report Series, [S. l.], v. 13, n. 180, 1984. DOI: 10.7146/dpb.v13i180.7455. Disponível em: https://tidsskrift.dk/daimipb/article/view/7455. Acesso em: 5 feb. 2026.