@article{AA_2004_16_3_a1,
     author = {Vit. V. Volchkov},
     title = {Local two radii theorem on the sphere},
     journal = {Algebra i analiz},
     pages = {24--55},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2004_16_3_a1/}
}