HENSON, Martin C.; REEVES, Steve; BOWEN, Jonathan P. Z Logic and its Consequences. COMPUTING AND INFORMATICS, [S. l.], v. 22, n. 3-4, p. 381–415, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/461. Acesso em: 3 may. 2024.