A note on the projective representations of finite groups
Rendiconti del Seminario Matematico della Università di Padova, Tome 102 (1999), pp. 23-27. 
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     author = {Marcu, D\u{a}nu\c{t}},
     title = {A note on the projective representations of finite groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {23--27},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {102},
     year = {1999},
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     zbl = {0943.20011},
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     url = {http://www.numdam.org/item/RSMUP_1999__102__23_0/}
}
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Marcu, Dănuţ. A note on the projective representations of finite groups. Rendiconti del Seminario Matematico della Università di Padova, Tome 102 (1999), pp. 23-27. http://www.numdam.org/item/RSMUP_1999__102__23_0/

[1] G. Karpilovsky, Projective Representations of Finite Groups, Monographs and Textbooks in Pure and Applied Mathematics, 94, Marcel Dekker (1985). | MR | Zbl

[2] A.O. Morris, Projective representations of abelian groups, J. London Math. Soc., 7 (1973), pp. 235-238. | MR | Zbl