%0 Journal Article %A Svoboda, Karel %T Remark on surfaces in $E^4$ satisfying certain relations between covariant derivatives of the mean and Gauss curvatures %J Commentationes Mathematicae Universitatis Carolinae %D 1978 %P 619-626 %V 19 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1978__19_4_a0/ %G en %F CMUC_1978__19_4_a0