@article{NUMA_1969__13_131934,
     author = {F. NATTERER},
     title = {Numerische {Behandlung} singul\"arer {Sturm-Liouville-Probleme.}},
     journal = {Numerische Mathematik},
     pages = {434--447},
     publisher = {mathdoc},
     volume = {13},
     year = {1969},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1969__13_131934/}
}