1. Agliano, P., Baker, K.A.: Congruence intersection properties for varieties of algebras. J. Aust. Math. Soc. (Ser. A) 67, 104–121 (1999)
2. S. Blyth, T.S.: Lattices and Ordered Algebraic Structures. Springer, Berlin (2005)
3. Burris, S., Sankappanavar, H.S.: A Course in Universal Algebra. Graduate Texts in Mathematics, vol. 78. Springer, Berlin (1981)
4. Gillibert, P.: Points critiques de couples de variétés d’algèbres. Ph.D. thesis, Universitè de Caen (2008)
5. Gillibert, P.: Critical points of pairs of varieties of algebras. Int. J. Comput. 19, 1–40 (2009)