@article{IM2_2014_78_1_a0,
     author = {V. V. Volchkov and Vit.{\CYRV} V.{\CYRV} Volchkov},
     title = {Local two-radii theorems on the multi-dimensional sphere},
     journal = {Izvestiya. Mathematics},
     pages = {1--21},
     year = {2014},
     volume = {78},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2014_78_1_a0/}
}