%0 Journal Article
%A Konrad Schmüdgen
%T Perturbations of Selfadjoint Operators with Point Spectra by Restrictions and Selfadjoint Extensions.
%J Mathematische Annalen
%D 1981
%P 233-248
%V 256
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1981__256_163508/
%F MAN_1981__256_163508