Relations between the radii of the inscribed and circumscribed spheres of a closed, convex surface
Doklady Akademii Nauk, Tome 148 (1963) no. 2, pp. 268-270.

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     author = {V. K. Ionin},
     title = {Relations between the radii of the inscribed and circumscribed spheres of a closed, convex surface},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
     volume = {148},
     number = {2},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a6/}
}
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V. K. Ionin. Relations between the radii of the inscribed and circumscribed spheres of a closed, convex surface. Doklady Akademii Nauk, Tome 148 (1963) no. 2, pp. 268-270. http://geodesic.mathdoc.fr/item/DAN_1963_148_2_a6/