%0 Journal Article
%A Ü. G. Lumiste
%T On surfaces $V_n$ with multidimensional isotropic conjugate directions in spaces $R_N$ or $S_N$
%J Doklady Akademii Nauk
%D 1957
%P 702-705
%V 114
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1957_114_4_a6/
%G ru
%F DAN_1957_114_4_a6