%0 Journal Article
%A Gh. Constantin
%T On operators with the same spectrum
%J Matematički vesnik
%D 1975
%P 25 
%V 27
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MV_1975_27_1_a2/
%F MV_1975_27_1_a2