1. [1] D. L. White, Character degrees of extensions of and . J. Group Theory 16(1) (2013), 1-33.
2. [2] E. Bannai and H. Tanaka, The decomposition of the permutation character . J. Algebra, 265(2) (2003), 496-512.
3. [3] I. M. Isaacs, Character theory of finite groups. Academic Press, New York, (1976).
4. [4] K. E. Gehles, Ordinary characters of finite special linear groups. M. S. c. dissertation, School of Mathematics and Statistics, University of St. Andrews (2002).
5. [5] M. Wildon, Multiplicity-free representations of symmetric groups. J. Pure Appl.Algebra, 213 (2009), 1464-1477.