A note on the converse of the Clifford's theorem and some consequences
Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 189-191. 
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     author = {Navarro, G.},
     title = {A note on the converse of the {Clifford's} theorem and some consequences},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {189--191},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {77},
     year = {1987},
     mrnumber = {904620},
     zbl = {0623.20006},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1987__77__189_0/}
}
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Navarro, G. A note on the converse of the Clifford's theorem and some consequences. Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 189-191. http://archive.numdam.org/item/RSMUP_1987__77__189_0/

[1] B. Huppert, Endliche Gruppen I, Springer-Verlag, 1967. | MR | Zbl

[2] I. Martin Isaacs, Character Theory of Finite Groups, Academic Press, 1976. | MR | Zbl