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@article{MS2_1980__47_166728, author = {Bent Birkeland}, title = {A singular {Sturm-Liouville} problem treated by non-standard analysis.}, journal = {Mathematica Scandinavica}, pages = {275--294}, publisher = {mathdoc}, volume = {47}, year = {1980}, zbl = {0438.34019}, url = {http://geodesic.mathdoc.fr/item/MS2_1980__47_166728/} }
Bent Birkeland. A singular Sturm-Liouville problem treated by non-standard analysis.. Mathematica Scandinavica, Tome 47 (1980), pp. 275-294. http://geodesic.mathdoc.fr/item/MS2_1980__47_166728/