@article{PIM_1956_S_S_IX_09_a6,
     author = {T. P. Angelitch},
     title = {Eine {Bemerkung} {Zu} {Den} {Gleichungen} {Von} {Beltraimi-Michell}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {93 },
     publisher = {mathdoc},
     volume = {_S_S_IX},
     number = {09},
     year = {1956},
     url = {http://geodesic.mathdoc.fr/item/PIM_1956_S_S_IX_09_a6/}
}