@article{AL_2013_52_5_a8,
     author = {M. A. Grechkoseeva},
     title = {Element orders in covers of finite simple groups},
     journal = {Algebra i logika},
     pages = {638--641},
     year = {2013},
     volume = {52},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2013_52_5_a8/}
}