TY  - JOUR
AU  - Bent Birkeland
TI  - A singular Sturm-Liouville problem treated by non-standard analysis.
JO  - Mathematica Scandinavica
PY  - 1980
SP  - 275
EP  - 294
VL  - 47
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1980__47_166728/
ID  - MS2_1980__47_166728
ER  -