1. On the number of blocks of irreducible characters of a finite group with a given defect group;Iizuka;Kumamoto J. Sci. (Math.),1973
2. Blocks and centers of group algebras;Michler,1972
3. Sections and ideals of centers of group algebras;Reynolds;J. Algebra,1972
4. On the block of defect zero;Tsushima;Nagoya Math. J.,1971
5. On the p′-section sum in a finite group ring;Tsushima;Math. J. Okayma Univ.,1978