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math.CO2018★ 9 cited
Goethals--Seidel difference families with symmetric or skew base blocks
Dragomir Z. Djokovic, Ilias S. Kotsireas
We single out a class of difference families which is widely used in some constructions of Hadamard matrices and which we call Goethals--Seidel (GS) difference families. They consi…
math.CO2014★ 9 cited
D-optimal matrices of orders 118, 138, 150, 154 and 174
Dragomir Z. Djokovic, Ilias S. Kotsireas
We construct supplementary difference sets (SDS) with parameters , , , and . These SDSs give D-optimal d…