FREUND, R.; WACHTLER, F. Universal Systems with Operations Related to Splicing. COMPUTING AND INFORMATICS, [S. l.], v. 15, n. 4, p. 273–294, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/689. Acesso em: 13 apr. 2024.