@article{NUMA_1974__23_132316,
     author = {F. Natterer},
     title = {Das {Differenzenverfahren} f\"ur singul\"are {Rand-Eigenwertaufgaben} gew\"ohnlicher {Differentialgleichungen.}},
     journal = {Numerische Mathematik},
     pages = {387--410},
     publisher = {mathdoc},
     volume = {23},
     year = {1974},
     zbl = {0306.65050},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1974__23_132316/}
}