A note on conjugacy class sizes of finite groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 106 (2001), pp. 255-260. 
@article{RSMUP_2001__106__255_0,
     author = {Bianchi, Mariagrazia and Gillio, Anna and Casolo, Carlo},
     title = {A note on conjugacy class sizes of finite groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {255--260},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {106},
     year = {2001},
     mrnumber = {1876222},
     zbl = {02216804},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_2001__106__255_0/}
}
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Bianchi, Mariagrazia; Gillio, Anna; Casolo, Carlo. A note on conjugacy class sizes of finite groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 106 (2001), pp. 255-260. http://archive.numdam.org/item/RSMUP_2001__106__255_0/

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[4] A. Mann, A Note on Conjugacy Class Sizes, Algebra Coll., 4 (1997), pp. 169-174. | MR | Zbl