Author: 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
- : On characterization of the sphere in $E^4$ by means of the parallelness of certain vector fields. (English). Časopis pro pěstování matematiky, vol. 105 (1980), issue 1, pp. 56-72
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