%0 Journal Article
%A S. A. Smagin
%T Fractional powers of a hypoelliptic operator in $\mathbf{R}^n$
%J Doklady Akademii Nauk
%D 1973
%P 1033-1035
%V 209
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1973_209_5_a7/
%G ru
%F DAN_1973_209_5_a7