1. Algebraic Combinatorics I: Association Schemes;Bannai,1984
2. Distance-Regular Graphs;Brouwer,1989
3. Dual polar spaces;Cameron;Geom. Dedicata,1982
4. Characterization of H(n,q) by the parameters;Egawa;J. Combin. Theory Ser. A,1981
5. Characterization of a class of distance-regular graphs;Neumaier;J. Reine Angew. Math,1985