Extremal self-dual codes of length 64 through neighbors and covering radii. - Naoki Chigira; Masaaki Harada; Masaaki Kitazume (Des. Codes Cryptogr., 2007)

On the Classification of Extremal Doubly Even Self-Dual Codes with 2-Transitive Automorphism Group - Naoki Chigira; Masaaki Harada; Masaaki Kitazume (CoRR, 2013)

On the classification of extremal doubly even self-dual codes with 2-transitive automorphism groups. - Naoki Chigira; Masaaki Harada; Masaaki Kitazume (Des. Codes Cryptogr., 2014)

Self-Dual Codes Related to the Rudvalis Group. - Naoki Chigira; Masaaki Kitazume (Graphs Comb., 2018)