REFERENCES
- Dark , R. , Scoppola , C. M. ( 1996 ). On Camina groups of prime power order . J. Algebra 181 : 787 – 802 .
- Isaacs , I. M. ( 1976 ). Character Theory of Finite Groups . New York : Academic Press .
- Qian , G. , Shi , W. , You , X. ( 2004 ). Conjugacy classes outside a normal subgroup . Comm. Algebra 32 ( 12 ): 4809 – 4820 .
- Zhmud , E. M. ( 1979 ). On finite groups having an irreducible complex character with one class of zeros . Soviet Math. Dokl. 20 : 795 – 797 .
- Communicated by A. Turull.