%0 Journal Article
%A I. V. Gel'man
%T Equivalence of some unbounded operators in Banach space
%J Doklady Akademii Nauk
%D 1961
%P 764-767
%V 137
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_137_4_a1/
%G ru
%F DAN_1961_137_4_a1