KELEMEN, J.; PAUN, Gh. Foreword: Special Issue on Grammar Systems. Computing and Informatics, [S. l.], v. 15, n. 2-3, p. 105–108, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/694. Acesso em: 11 may. 2025.