1. A. I. Mal'tsev, ?On some boundary problems of algebra and mathematical logic,? in: Proceedings of the International Congress of Mathematicians, Moscow, 1966 [in Russian], Mir, Moscow (1968), pp. 217?231.
2. G. Birkhoff, ?Universal algebra,? in: Proceedings of the First Canadian Math. Congress, Montreal, 1945, The University of Toronto Press (1946), pp. 310?326.
3. V. A. Gorbunov, ?On lattices of quasivarieties,? Algebra Logika,15, No. 4, 436?457 (1976).
4. V. A. Gorbunov and V. I. Tumanov, ?The structure of lattices of quasivarieties,? Trudy Inst. Mat., Akad. Nauk SSSR. Sib. Otdel.,2, 12?44 (1982).
5. W. Dziobiak, ?On atoms in the lattice of quasivarieties,? Algebra Univ.,24, 32?35 (1987).