ILIE, L. Collapsing Hierarchies in PCGSs with Communication by Commands. COMPUTING AND INFORMATICS, [S. l.], v. 15, n. 2-3, p. 173–184, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/699. Acesso em: 9 may. 2024.