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2. Remarks on Sade's disproof of the Euler conjecture with an application to latin squares orthogonal to their transpose;Crampin;J. Comb. Theory, Ser. A,1975
3. Latin Squares and their Applications;Denes,1974
4. Combinatorial Theory;Hall,1967
5. Almost graeco–latin squares;Heinrich;Ars Combin.,1980