1. [1] E. Bannai and T. Ito, Algebraic Combinatorics I: Association Schemes (Benjamin/Cummings, Menlo Park, CA, 1984).
2. [2] E. Bannai and A. Munemasa, Terwilliger algebras of group association schemes, in preparation.
3. [3] C. Curtis and I. Reiner, Representation Theory of Finite Groups and Associative Algebras (Inter-science, New York, 1962).
4. [4] D. Higman. Coherent configurations, part I: Ordinary representation theory. Geom. Ded. 4 (1975) 1-32.
5. [5] M.A. Naimark and A.I. Stern, Theory of Group Representations (Springer-Verlag, New York, Heidelberg, Berlin, 1982).