%0 Journal Article
%A P. E. Sobolevskii
%T First order differential equations in Hilbert space with a variable positively defined self-adjoined operator whose fractional power has a constant definition domain
%J Doklady Akademii Nauk
%D 1958
%P 984-987
%V 123
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_123_6_a7/
%G ru
%F DAN_1958_123_6_a7