@article{SM_2002_193_6_a2,
     author = {A. M. Gaisin},
     title = {Solution of {the~Polya} problem},
     journal = {Sbornik. Mathematics},
     pages = {825--845},
     publisher = {mathdoc},
     volume = {193},
     number = {6},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_6_a2/}
}