1. Belousov, V.D.: Systems of Quasigroups with Generalised Identities, Usp. Mat. Nauk., 20 (1965), No. 1 (121), 74?146. Russian Math. Surveys 20 (1965), 73?143.
2. Bruck, R.H.: Finite Nets, I. Numerical Invariants, Can. J. Math., 3 (1951), 94?107.
3. Bruck, R.H.: Finite Nets, II. Uniqueness and Imbedding, Pac. J. Math., 13 (1963), 421?457.
4. Dénes, J. /Keedwell, A.D.: Latin Squares and their Applications, Akadémiai Kiadó, Budapest, 1974.
5. Heise, W. /Quattrocchi, P.: Informations- und Codierungstheorie, 2. Auflage, Springer Verlag, Berlin, Heidelberg, 1989.