@article{IM2_2013_77_4_a9,
     author = {I. A. Cheltsov and K. A. Shramov},
     title = {Sporadic simple groups and quotient singularities},
     journal = {Izvestiya. Mathematics },
     pages = {846--854},
     publisher = {mathdoc},
     volume = {77},
     number = {4},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2013_77_4_a9/}
}