DE LARA, Juan; VELASCO, Pedro. Petri Nets and Matrix Graph Grammars: Reachability. Electronic Communications of the EASST, [S. l.], v. 2, 2007. DOI: 10.14279/tuj.eceasst.2.60. Disponível em: https://www.eceasst.org/index.php/eceasst/article/view/1398. Acesso em: 23 jul. 2025.