[1] D. Bubboloni, S. Dolfi, and P. Spiga, Finite groups whose irreducible characters vanish only on p-elements, J. Pure. Appl. Algebra., 213 No. 3 (2009) 370-376.
[2] S. Dolfi, E. Pacifici, L. Sanus, and P. Spiga, On the vanishing prime graph of solvable groups, J. Group Theory., 13 (2010) 189-206.
[3] L. Dornhoff, Group Representation Theory Part A (Ordinary Representation Theory), Macel Dekker, New York, 1971.
[4] I. M. Isaacs, Character Theory of Finite Groups, Academic Press , New York-San Francisco-London, 2006.
[5] I. M. Isaacs, G. Navarro, and T. R. Wolf, Finite group elements where no irreducible character vanishes, J. Algebra., 222 No. 2 (1999) 413-423.
[6] G. D. James and M. W. Liebeck, Representations and Characters of Groups, Cambridge University Press, 1993.
[7] S. M. Robati, Frobenius groups with almost distinct conjugacy class sizes, B. Malays. Math. Sci. So., 41 No. 4 (2018) 1711-1715.
[8] S. M. Robati, Groups whose set of vanishing elements is the union of at most three conjugacy classes, B. Belg. Math. Soc-Sim., 26 No. 1 (2019) 85-89.
[9] S. M. Robati, Groups whose set of vanishing elements is exactly a conjugacy class, Alg. Struc. Appl., 6 No. 2 (2019) 9-12.
[10] S. M. Robati and M. R. Darafsheh, Finite groups with at most six vanishing conjugacy classes, J. Algebra Appl., 21 No. 04 (2022) 2250076.
[11] W. J. Wong, Finite groups with a self-centralizing subgroup of order 4, J. Aust. Math. Soc., 7 No. 4 (1967) 570-576.
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