%0 Journal Article
%A J.I. NIETO
%T On Fredholm Operators and the Essential Spectrum of Singular Integral Operators.
%J Mathematische Annalen
%D 1968
%P 62-77
%V 178
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1968__178_161735/
%F MAN_1968__178_161735