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Svoboda, Karel
Several new characterizations of the 2-dimensional sphere in $E^4$. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 4, pp. 573-583
MSC: 53A05 | MR 548220 | Zbl 0435.53006 | DOI: 10.21136/CMJ.1979.101639
References:
[1] K. Svoboda: Characterizations of the sphere in $E\sp{4}$ by means of the pseudoparallel mean curvature vector field. Čas. pěst. matem. 30 (1980). MR 0588677
[2] K. Svoboda: Remark on surfaces in $E\sp{4}$ satisfying certain relations between covariant derivatives of the mean and Gauss curvatures. Comm. math. Univ. Car. 19, 4 (1978), p. 619-626. MR 0518175
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