%0 Journal Article
%A R. R. Mullari
%T On the principle directions of an $m$-dimensional surface
%J Doklady Akademii Nauk
%D 1962
%P 989-992
%V 144
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1962_144_5_a11/
%G ru
%F DAN_1962_144_5_a11