Abstract
Suppose In is a square-free odd integer, and A and B are any two Hadamard matrices of order 4m. We will show that A and B are equivalent over the integers (that is, B can be obtained from A using elementary row and column operations which involve only integers).
Publication Details
W.D.Wallis and Jennifer Seberry Wallis, Equivalence of Hadamard matrices, Israel Journal of Mathematics, 7, (1969), 122-128.