%0 Journal Article %A Naumann, Joachim %T A characterization of the eigenvalues of a completely continuous selfadjoint operator %J Commentationes Mathematicae Universitatis Carolinae %D 1972 %P 63-78 %V 13 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1972__13_1_a5/ %G en %F CMUC_1972__13_1_a5