@article{DAN_1963_148_2_a6,
     author = {V. K. Ionin},
     title = {Relations between the radii of the inscribed and circumscribed spheres of a closed, convex surface},
     journal = {Doklady Akademii Nauk},
     pages = {268--270},
     publisher = {mathdoc},
     volume = {148},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a6/}
}