1. Adams, M. E., Principal congruences in De Morgan algebras, Eidimburgh Mathematical Society 30:415–421, 1987.
2. Balbes, R., and P. Dwinger, Distributive lattices, University of Missouri Press, Columbia, 1974.
3. Boicescu, V., A. Filipoiu, G. Georgescu, and S. Rudeanu, Łukasiewicz - Moisil Algebras, Annals of Discrete Mathematics 49, North - Holland, 1991.
4. Celani, S., Classical modal De Morgan algebras, Studia Logica 98(1–2):251–266, 2011.
5. Cignoli, R., Quantifiers on distributive lattices, Discrete Mathematics 96:183-197, 1991.