%0 Journal Article
%A Bent Birkeland
%T A singular Sturm-Liouville problem treated by non-standard analysis.
%J Mathematica Scandinavica
%D 1980
%P 275-294
%V 47
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1980__47_166728/
%F MS2_1980__47_166728