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Dedicado a Benedito de Morais
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do Carmo, M., Lima, E. Immersions of manifolds with non-negative sectional curvatures. Bol. Soc. Bras. Mat 2, 9–22 (1971). https://doi.org/10.1007/BF02584681
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DOI: https://doi.org/10.1007/BF02584681