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[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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