[1] J. Dénes A. D. Keedwell: 
Latin squares and their applications. Akadémiai Kiadó, Budapest 1974. 
MR 0351850 
[2] A. Drápal T. Kepka: 
Parity of orthogonal automorphisms. Comment. Math. Univ. Carolinae 28 (1987), 251-259. 
MR 0904751 
[3] A. Drápal T. Kepka: 
Parity of orthogonal permutations. Comment. Math. Univ. Carolinae 28 (1987), 427-432. 
MR 0912571