@misc{MZ_1925__23_167856,
     title = {Lavrentieff, {M.,} {Sur} une \'equation diff\'erentielle du premier ordre},
     journal = {Mathematische Zeitschrift},
     pages = {197--209},
     publisher = {mathdoc},
     volume = {23},
     year = {1925},
     zbl = {51.0332.04},
     url = {http://geodesic.mathdoc.fr/item/MZ_1925__23_167856/}
}