[1] V. D. BELOUSOV:
Osnovy teorii kvazigrupp i lup. Moskva, Nauka 1967.
MR 0218483
[3] J. JEŽEK:
On the equivalence between primitive classes of universal algebras. Z. math. Logik u. Grundl. Math. 14 (1968), 309-320.
MR 0236087
[4] T. KEPKA P. NĚMEC:
$T$-quasigroups II. Acta Univ. Carolinae Math. et Phys. 12/2 (1971), 31-49.
MR 0320206
[5] P. NĚMEC T. KEPKA:
$T$-quasigroups I. Acta Univ. Carolinae Math. et Phys. 12/1 (1971), 39-49.
MR 0320206