JONSSON, B. Equational Classes of Lattices. MATHEMATICA SCANDINAVICA, [S. l.], v. 22, p. 187–196, 1968. DOI: 10.7146/math.scand.a-10882. Disponível em: https://www.mscand.dk/article/view/10882. Acesso em: 28 apr. 2024.