NIELSEN, M.; ROZENBERG, G.; THIAGARAJAN, P. S. Behavioural Notions for Elementary Net Systems. DAIMI Report Series, [S. l.], v. 18, n. 281, 1989. DOI: 10.7146/dpb.v18i281.6658. Disponível em: https://tidsskrift.dk/daimipb/article/view/6658. Acesso em: 8 may. 2024.