COUFAL, David. Coherence of radial implicative fuzzy systems with nominal consequents. Journal of Telecommunications and Information Technology, Warsaw, Poland, v. 26, n. 4, p. 60–66, 2006. DOI: 10.26636/jtit.2006.4.393. Disponível em: https://jtit.pl/jtit/article/view/393. Acesso em: 4 aug. 2026.