CSENKI, Attila. Difference lists in Prolog. Teaching Mathematics and Computer Science, [S. l.], v. 8, n. 1, p. 73–87, 2010. DOI: 10.5485/TMCS.2010.0242. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14866. Acesso em: 27 sep. 2024.