BALEVA, V. A SEMANTICS OF LOGIC PROGRAMS WITH PARAMETERS. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 95, p. 15–39, 2003. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/173. Acesso em: 11 apr. 2025.