@article{MZ_1919__5_167540,
     author = {G., Scheffers},
     title = {Eigenschaften der {Integralfl\"achen} der partiellen {Differential-gleichung} s2?rt==konst.},
     journal = {Mathematische Zeitschrift},
     pages = {112--117},
     publisher = {mathdoc},
     volume = {5},
     year = {1919},
     zbl = {47.0949.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1919__5_167540/}
}