ESPARZA, Javier; NIELSEN, Mogens. Decidability Issues for Petri Nets. BRICS Report Series, [S. l.], v. 1, n. 8, 1994. DOI: 10.7146/brics.v1i8.21662. Disponível em: https://tidsskrift.dk/brics/article/view/21662. Acesso em: 6 dec. 2025.