REFERENCES
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- Mazurov , V. D. ( 1997 ). Characterizations of finite groups by the sets of orders of their elements . Alg. Log. 36 : 37 – 53 .
- Vasilev , A. V. ( 2005 ). On connection between the structure of a finite groups and the properties of its prime graph . Sib. Math. Zh. 46 : 396 – 404 .
- Zavarnitsine , A. V. ( 2009 ). Finite simple groups with narrow prime spectrum . Siberian Electronic Math. Reports 6 : 1 – 12 .
- Communicated by A. Olshanskii.