Amicable Orthogonal Designs-Existence
Canadian journal of mathematics, Tome 28 (1976) no. 5, pp. 1006-1020

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Definition. An orthogonal design in order n and of type (u1, ... , us) on the commuting variables x1, . . . , xs is an n X n matrix, X, with entries from the set {0, ±x1, ... , ±xs} such that
Wolfe, Warren. Amicable Orthogonal Designs-Existence. Canadian journal of mathematics, Tome 28 (1976) no. 5, pp. 1006-1020. doi: 10.4153/CJM-1976-099-5
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