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Svoboda, Karel
Characterizations of the sphere in $E^4$ by means of the pseudoparallel mean curvature vector field. (English). Časopis pro pěstování matematiky, vol. 105 (1980), issue 3, pp. 266-277
MSC: 53A05 | MR 588677 | Zbl 0435.53005 | DOI: 10.21136/CPM.1980.118069
References:
[1] A. Švec: Contributions to the global differential geometгy of surfaсes. Rozpravy ČSАV 1, 87, 1977, p. 1-94. MR 0467608
[2] K. Svoboda: Some global сharaсterizations of the sphere in E4. Čas. pro pěst. matem. 103 (1978), p. З91-З99. MR 0512236
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