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Hopf, H., Katsurada, Y. Some congruence theorems for closed hypersurfaces in riemann space (Part II: Method based on a maximum principle). Commentarii Mathematici Helvetici 43, 217–223 (1968). https://doi.org/10.1007/BF02564392
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DOI: https://doi.org/10.1007/BF02564392