%0 Journal Article
%A V. V. Filippov
%T The preservation of the multiplicity of a basis under a perfect map
%J Doklady Akademii Nauk
%D 1968
%P 1077-1079
%V 181
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_181_5_a12/
%G ru
%F DAN_1968_181_5_a12