The Hall-Janko graph and the Witt system W10. - Naoyuki Horiguchi; Masaaki Kitazume; Hiroyuki Nakasora (Eur. J. Comb., 2008)

On the classification of the codes obtained by subtracting from some ternary extremal self-dual codes. - Naoyuki Horiguchi (Int. J. Inf. Coding Theory, 2009)

A construction of the sporadic Suzuki graph from U3(4). - Andries E. Brouwer; Naoyuki Horiguchi; Masaaki Kitazume; Hiroyuki Nakasora (J. Comb. Theory A, 2009)

On the support designs of extremal binary doubly even self-dual codes. - Naoyuki Horiguchi; Tsuyoshi Miezaki; Hiroyuki Nakasora (Des. Codes Cryptogr., 2014)

Erratum to: On the support designs of extremal binary doubly even self-dual codes. - Naoyuki Horiguchi; Tsuyoshi Miezaki; Hiroyuki Nakasora (Des. Codes Cryptogr., 2014)