Operators and Matrices · Volume 3, Issue 4 Supplementary difference sets with symmetry for Hadamard matrices 03-33 Pages 557-569 DOI 10.7153/oam-03-33 Downloads Short PDF Full PDF PNG Authors Dragomir Ž. Đoković Keywords supplementary difference sets Hadamard matrices Williamson matrices Goethals-Seidel array Subject classes 05B20 05B30