@article{10_4153_CJM_1991_045_6,
     author = {Michler, G. O. and Olsson, J. B.},
     title = {Weights for {Covering} {Groups} of {Symmetric} and {Alternating} {Groups,} {\cyrr} \ensuremath{\neq} 2},
     journal = {Canadian journal of mathematics},
     pages = {792--813},
     year = {1991},
     volume = {43},
     number = {4},
     doi = {10.4153/CJM-1991-045-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-045-6/}
}