JENSEN, K.; KYNG, M.; MADSEN, O. L. Delta Semantics Defined by Petri Nets. DAIMI Report Series, [S. l.], v. 8, n. 95, 1979. DOI: 10.7146/dpb.v8i95.6511. Disponível em: https://tidsskrift.dk/daimipb/article/view/6511. Acesso em: 9 may. 2024.