1. Koichi Betsumiya, Minimum Lee weights of type II codes over F2r, Discrete Math. 308 (2008), no. 14, 3018–3022.[MR]
  2. Koichi Betsumiya, T. Aaron Gulliver, and Masaaki Harada, Binary optimal linear rate 1/2 codes, Applied Algebra, Algebraic Algorithms and Error-correcting Codes (Honolulu, HI, 1999), Lecture Notes in Comput. Sci., vol. 1719, Springer, Berlin, 1999, pp. 462–471.[MR]
  3. Koichi Betsumiya, T. Aaron Gulliver, and Masaaki Harada, Extremal self-dual codes over F2×F2, Des. Codes Cryptogr. 28 (2003), no. 2, 171–186.[MR]
  4. Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada, and Akihiro Munemasa, On type II codes over F4, IEEE Trans. Inform. Theory 47 (2001), no. 6, 2242–2248.[MR]
  5. Koichi Betsumiya and Masaaki Harada, Binary optimal odd formally self-dual codes, Des. Codes Cryptogr. 23 (2001), no. 1, 11–21.[MR]
  6. Koichi Betsumiya and Masaaki Harada, Classification of formally self-dual even codes of lengths up to 16, Des. Codes Cryptogr. 23 (2001), no. 3, 325–332.[MR]
  7. Koichi Betsumiya and Masaaki Harada, Formally self-dual codes related to Type II codes, Appl. Algebra Engrg. Comm. Comput. 14 (2003), no. 2, 81–88.[MR]