@article{SM_1995_186_6_a1,
     author = {V. V. Volchkov},
     title = {A definitive version of the~local two-radii theorem},
     journal = {Sbornik. Mathematics},
     pages = {783--802},
     publisher = {mathdoc},
     volume = {186},
     number = {6},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_186_6_a1/}
}