[1] J. Dénes A. D. Keedwell:
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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