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References:
[1] A. Švec: Several new characterizations of the sphere. Czech. Math. J., 25 (100) 1975, 645-652. MR 0388293
[2] U. Simon: A further method in global differential geometry. Abh. Math. Sem. Hamburg 44 (1975), 52-69. DOI 10.1007/BF02992946 | MR 0394513
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