@article{SM_2013_204_12_a7,
     author = {A. A. Yadchenko},
     title = {On {Isaacs'} problem},
     journal = {Sbornik. Mathematics},
     pages = {1839--1848},
     publisher = {mathdoc},
     volume = {204},
     number = {12},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2013_204_12_a7/}
}