1. Anthony V. Geramita, Joan Murphy Geramita, Jennifer Seberry Wallis, Orthogonal designs, Linear and Multilinear Algebra, (to appear).
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3. Marshall Hall Jr., Combinatorial Theory. (Blaisdell, Waltham, Mass., 1967).
4. P. Robinson, private communication, 1975.
5. D. Shapiro, private communication, 1975.