TY - JOUR AU - Svoboda, Karel TI - Remark on surfaces in $E^4$ satisfying certain relations between covariant derivatives of the mean and Gauss curvatures JO - Commentationes Mathematicae Universitatis Carolinae PY - 1978 SP - 619 EP - 626 VL - 19 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMUC_1978__19_4_a0/ LA - en ID - CMUC_1978__19_4_a0 ER -