%0 Journal Article
%A P. E. Sobolevskii
%T On fractional powers of weakly positive operators
%J Doklady Akademii Nauk
%D 1966
%P 1296-1299
%V 166
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_166_6_a9/
%G ru
%F DAN_1966_166_6_a9