Aspects of complete sets of 9 × 9 pairwise orthogonal latin squares.

P. J. Owens Donald A. Preece Aspects of complete sets of 9 × 9 pairwise orthogonal latin squares. 519-525 1997 167-168 Discret. Math. https://doi.org/10.1016/S0012-365X(97)89938-4 db/journals/dm/dm167.html#OwensP97