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1977 On the isometric structure of Riemannian manifolds of non-negative Ricci curvature containing a compact hypersurface without focal point
Kiyotaka Ii
Tohoku Math. J. (2) 29(1): 1-8 (1977). DOI: 10.2748/tmj/1178240691
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Vol.29 • No. 1 • 1977
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