1. Aczél, J., Belousov, V.D., Hosszú, M.: Generalized associativity and bisymmetry on quasigroups. Acta Math. Acad. Sci. Hungar. 11, 127–136 (1960). MR 25 #4018. Zbl 90, 243a (e: 090.24301)
2. Akivis M.A., Goldberg V.V.: Solution of Belousov’s problem. Discuss. Math. Gen. Algebra Appl 21(1), 93–103 (2001) MR 2002h:20098. Zbl 1002.20047
3. Belousov V.D.: Assotsiativnye sistemy kvazigrupp. [Associative systems of quasigroups.] (In Russian.) Uspekhi Mat. Nauk 13, 243 (1958)
4. Belousov V.D.: Assotsiativnye v tselom systemy kvazigrupp. [Globally associative systems of quasigroups.] (In Russian.) Mat. Sb. (N.S.) 55(97), 221–236 (1961) MR 27 #2578. Zbl 124, 256c (e: 124.25603)
5. Belousov V.D.: Balanced identities in algebras of quasigroups. Aequationes Math 8, 1–73 (1972) MR 46 #7429. Zbl251.20074