%0 Journal Article
%A P. P. Zabreiko
%A M. A. Krasnosel'skii
%A E. I. Pustyl'nik
%T On fractional powers of elliptic operators
%J Doklady Akademii Nauk
%D 1965
%P 990-993
%V 165
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1965_165_5_a2/
%G ru
%F DAN_1965_165_5_a2