WANG, Z.; HU, Y.; ZHANG, J. Petri Nets based Production System Model Simplification. Elektronika ir Elektrotechnika, [S. l.], v. 123, n. 7, p. 113-118, 2012. DOI: 10.5755/j01.eee.123.7.2388. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/2388. Acesso em: 27 sep. 2022.