%0 Journal Article
%A V. I. Burenkov
%T On the extension of functions with preservation and with deterioration of the differential properties
%J Doklady Akademii Nauk
%D 1975
%P 269-272
%V 224
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_224_2_a3/
%G ru
%F DAN_1975_224_2_a3