@article{MZ_1928__27_167997,
     author = {E., Kamke},
     title = {\"Uber die {Clairautsche} {Differentialgleichung}},
     journal = {Mathematische Zeitschrift},
     pages = {623--639},
     publisher = {mathdoc},
     volume = {27},
     year = {1928},
     zbl = {54.0455.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1928__27_167997/}
}