@article{JRAM_1913__142_149395,
     author = {Oskar Perron},
     title = {\"Uber lineare {Differentialgleichungen,} bei denen die unabh\"angig {Variable} reell ist. {(Erste} {Mitteilung)}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {254--270},
     publisher = {mathdoc},
     volume = {142},
     year = {1913},
     zbl = {44.0370.01},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1913__142_149395/}
}