13 citations · 61 across the 31 of their papers we have counts for
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math.CO2017
New families of Hadamard matrices with maximum excess
Mitsugu Hirasaka, Koji Momihara, Sho Suda
In this paper, we find regular or biregular Hadamard matrices with maximum excess by negating some rows and columns of known Hadamard matrices obtained from quadratic residues of f…
math.CO2017★ 3 cited
Strongly regular Cayley graphs from partitions of subdifference sets of the Singer difference sets
Koji Momihara, Qing Xiang
In this paper, we give a new lifting construction of "hyperbolic" type of strongly regular Cayley graphs. Also we give new constructions of strongly regular Cayley graphs over the…
math.CO2017★ 1 cited
Construction of strongly regular Cayley graphs based on three-valued Gauss periods
Koji Momihara
In this paper, we give a construction of strongly regular Cayley graphs on the additive groups of finite fields based on three-valued Gauss periods. As consequences, we obtain two…