%0 Journal Article
%A F. S. Rofe-Beketov
%T On the spectrum of non-selfadjoint differential operators with periodic coefficients
%J Doklady Akademii Nauk
%D 1963
%P 1312-1315
%V 152
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_152_6_a10/
%G ru
%F DAN_1963_152_6_a10