Geodesic
Finite groups with a~$D$-block of cardinality~3
Fundamentalʹnaâ i prikladnaâ matematika, Tome 15 (2009) no. 2, pp. 23-33.

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The results of this paper are connected with one of the main problems of the representation theory, the problem of dependence between the character table of a finite group and its abstract structure. Finite groups that have a $D$-block of cardinality 3 for some normal subset $D$ are investigated. Some properties of classical $p$-blocks (where $p$ is a prime number) consisting of three irreducible characters are also obtained. 
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V. A. Belonogov. Finite groups with a~$D$-block of cardinality~3. Fundamentalʹnaâ i prikladnaâ matematika, Tome 15 (2009) no. 2, pp. 23-33. http://geodesic.mathdoc.fr/item/FPM_2009_15_2_a1/

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