@article{NUMA_1975__25_132374,
     author = {T. K\"upper},
     title = {Einschlie{\ss}ungsaussagen f\"ur gew\"ohnliche {Differentialoperatoren.}  {-Range-Domain} {Implications} for {Ordinary} {Differential} {Operators.}},
     journal = {Numerische Mathematik},
     pages = {201--214},
     publisher = {mathdoc},
     volume = {25},
     year = {1975},
     zbl = {0304.65052},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1975__25_132374/}
}