@article{ELMA_1951__6_140567,
     author = {Erich Sponder},
     title = {Ein zeichnerisches {L\"osungsverfahren} f\"ur {Differentialgleichungen} zweiter {Ordnung.}},
     journal = {Elemente der Mathematik},
     pages = {53--58},
     publisher = {mathdoc},
     volume = {6},
     year = {1951},
     zbl = {0042.36703},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1951__6_140567/}
}