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Translated from Matematicheskie Zametki, Vol. 26, No. 1, pp. 129–136, July, 1979.
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Sharafutdinov, V.A. Convex sets in a manifold of nonnegative curvature. Mathematical Notes of the Academy of Sciences of the USSR 26, 556–560 (1979). https://doi.org/10.1007/BF01140282
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DOI: https://doi.org/10.1007/BF01140282