%0 Journal Article
%A P. E. Sobolevskii
%T Comparison theorem for fractional powers of operators
%J Doklady Akademii Nauk
%D 1967
%P 294-297
%V 174
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1967_174_2_a9/
%G ru
%F DAN_1967_174_2_a9