On the existence of Hadamard matrices

On Orthogonal Matrices

R. E. A. C. Paley · Journal of Mathematics and Physics · 1933 · 607 citations

LX. <i>Thoughts on inverse orthogonal matrices, simultaneous signsuccessions, and tessellated pavements in two or more colours, with applications to</i> Newton's <i>rule, ornamental tile-work, and the theory of numbers</i>

J.J. Sylvester · The London Edinburgh and Dublin Philosophical Magazine and Journal of Science · 1867 · 336 citations

Natural Sciences, Mathematics, Applied Mathematics +4

Hadamard’s determinant theorem and the sum of four squares

John Williamson · Duke Mathematical Journal · 1944 · 217 citations

Natural Sciences, Mathematics, Number Theory +1

Note on Hadamard’s determinant theorem

John Williamson · Bulletin of the American Mathematical Society · 1947 · 37 citations · Full text

Natural Sciences, Mathematics, Combinatorics +4