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Svoboda, Karel
Some global characterizations of the sphere in $E^4$. (English). Časopis pro pěstování matematiky, vol. 103 (1978), issue 4, pp. 391-399
MSC: 53A05 | MR 512236 | Zbl 0402.53001 | DOI: 10.21136/CPM.1978.108790
References:
[1] A. Švec: Contributions to the global differential geometry of surfaces. Rozpravy ČSAV, 87, 1, 1977, 1-94. MR 0467608
[2] D. A. Hoffman: Surfaces in constant curvature manifolds with parallel mean curvature vector field. Bull. Am. Math. Soc, 78, 1972, 247-250. MR 0298601 | Zbl 0236.53054
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