@article{JRAM_1985__361_152748,
     author = {Friedrich Sch\"afke and Reinhard Sch\"afke},
     title = {Zur {Parameterabh\"angigkeit} bei {Differentialgleichungen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {361},
     year = {1985},
     zbl = {0558.34036},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__361_152748/}
}