%0 Journal Article
%A V. A. Rokhlin
%T The normal Euler numbers of the projective plane and Klein bottle in four-dimensional Euclidean space
%J Doklady Akademii Nauk
%D 1970
%P 27-29
%V 191
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1970_191_1_a6/
%G ru
%F DAN_1970_191_1_a6