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@article{IM_1993__112_3_144114, author = {Karsten Grove and Peter Petersen}, title = {A radius sphere theorem.}, journal = {Inventiones mathematicae}, pages = {577--584}, publisher = {mathdoc}, volume = {112}, number = {3}, year = {1993}, zbl = {0801.53029}, url = {http://geodesic.mathdoc.fr/item/IM_1993__112_3_144114/} }
Karsten Grove; Peter Petersen. A radius sphere theorem.. Inventiones mathematicae, Tome 112 (1993) no. 3, pp. 577-584. http://geodesic.mathdoc.fr/item/IM_1993__112_3_144114/