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Marenich, V. B.; Toponogov, V. A. Open manifolds of nonnegative curvature. (English. Russian original) Zbl 0729.53041 J. Sov. Math. 55, No. 6, 2115-2130 (1991). MSC: 53C20 53-02 53C29 53C55 PDFBibTeX XMLCite \textit{V. B. Marenich} and \textit{V. A. Toponogov}, J. Sov. Math. 55, No. 6, 2115--2130 (1991; Zbl 0729.53041) Full Text: DOI