@article{JRAM_1990__405_153210,
     author = {G.O. Michler and J.B. Olsson},
     title = {The {Alperin-McKay} conjecture holds in the covering groups of symmetric and alternating groups, p ... 2.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {78--111},
     publisher = {mathdoc},
     volume = {405},
     year = {1990},
     zbl = {0684.20011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__405_153210/}
}