Finite analogues of non-Euclidean spaces and Ramanujan graphs. - Eiichi Bannai; Osamu Shimabukuro; Hajime Tanaka 001 (Eur. J. Comb., 2004)

On the nonexistence of perfect codes in J(2w+p2, w). - Osamu Shimabukuro (Ars Comb., 2005)

On the number of irreducible modular representations of a P and Q polynomial scheme. - Osamu Shimabukuro (Eur. J. Comb., 2007)

Finite Euclidean graphs and Ramanujan graphs. - Eiichi Bannai; Osamu Shimabukuro; Hajime Tanaka 001 (Discret. Math., 2009)

On structures of modular adjacency algebras of Johnson schemes. - Osamu Shimabukuro (Discret. Math., 2011)

Square Subgroup of Rubik's Cube Group. - Osamu Ikawa; Osamu Shimabukuro (J. Inf. Process., 2013)