@article{AL_1982_21_6_a1,
     author = {A. N. Izmailov and V. P. Shunkov},
     title = {Two criteria for nonsimplicity of groups with an infinitely},
     journal = {Algebra i logika},
     pages = {647--669},
     year = {1982},
     volume = {21},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1982_21_6_a1/}
}