JONNSON, Bjarni. Algebras Whose Congruence Lattices are Distributive. Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 110–121, 1967. DOI: 10.7146/math.scand.a-10850. Disponível em: https://journals.msp.org/mscand/article/view/2471. Acesso em: 25 jul. 2026.