1. Almada T., Vaz de Carvalho J.: ‘A generalization of the Łukasiewicz algebras’. Studia Logica 69, 329–338 (2001)
2. Balbes, R., and P. Dwinger, Distributive Lattices, University of Missouri Press, 1974.
3. Berman J.: ‘Distributive lattices with an additional unary operation’. Aequationes Math. 16, 165–171 (1977)
4. Blyth T.S., Varlet J.C.: Ockham Algebras. Oxford University Press, Oxford-New York-Tokyo (1994)
5. Boicescu, V., A. Filipoiu, G. Georgescu and S. Rudeanu, ‘Łukasiewicz-Moisil Algebras’, Annals of Discrete Mathematics 49, North-Holland Publishing Co., Amsterdam, 1991.