[1] J. ACZÉL G. PICKERT F. RADÓ:
Nomogramme, Gewebe und Quasigruppen. Mathematica (Cluj) 2 (1960), 5-24.
MR 0124366
[2] J. ACZÉL:
Quasigroupa, Nets, and Nomograms. Advances in Mathematics 1 (1965), Fasc. 3, 383-450.
MR 0193174
[3] V. D. BELOUSOV:
Foundations of the Theory of Quasigroups and Loops. (in Russian). Moscow 1967.
MR 0218483