1. Eiichi Bannai and Etsuko Bannai, On Euclidean tight 4-designs, J. Math. Soc. Japan 58 (2006), no. 3, 775–804.[MR]
  2. Eiichi Bannai, Steven T. Dougherty, Masaaki Harada, and Manabu Oura, Type II codes, even unimodular lattices, and invariant rings, IEEE Trans. Inform. Theory 45 (1999), no. 4, 1194–1205.[MR]
  3. Eiichi Bannai, Osamu Shimabukuro, and Hajime Tanaka, Finite analogues of non-Euclidean spaces and Ramanujan graphs, European J. Combin. 25 (2004), no. 2, 243–259.[MR]
  4. Eiichi Bannai, Osamu Shimabukuro, and Hajime Tanaka, Finite Euclidean graphs and Ramanujan graphs, Discrete Math. 309 (2009), no. 20, 6126–6134.[MR/doi]