%0 Journal Article
%A Ernst Albrecht
%T On two questions of I. Colojoara and C. Foias.
%J Manuscripta mathematica
%D 1978
%P 1-16
%V 25
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1978__25_154555/
%F MM2_1978__25_154555