1. Yu. M. Movsisyan, Introduction to the Theory of Algebras with Hyperidentities (Russian) (Yerevan State University Press, Yerevan, 1986).
2. Yu. M. Movsisyan, Hyperidentities and Hypervarieties in Algebras (Russian) (Yerevan State University Press, Yerevan, 1990).
3. Yu. M. Movsisyan, “Algebras with hyperidentities of the variety of Boolean algebras”, Russ.Acad. Sci Izv. Math., 60, 1219–1260, 1996.
4. Yu. M. Movsisyan, “Hyperidentities in algebras and varieties, Uspekhi Mat. Nauk, 53(1), 61–114, 1998. English transl. in Russ. Math. Surveys, 53, 57–108, 1998.
5. G. Birkhoff, Lattice Theory (American Mathematical Society, Providence, 1979).