@article{MAN_1951__124_160265,
     author = {F. L\"obell},
     title = {Die {Integrabilit\"atsbedingung} f\"ur {Ortsfunktionen} in der nat\"urlichen {Fl\"achentheorie.}},
     journal = {Mathematische Annalen},
     pages = {151--157},
     publisher = {mathdoc},
     volume = {124},
     year = {1951},
     zbl = {0049.39101},
     url = {http://geodesic.mathdoc.fr/item/MAN_1951__124_160265/}
}