@article{GDZPPN001172727, title = {Einschlie\ss ungsaussagen f\"ur gew\"ohnliche Differentialoperatoren. -Range-Domain Implications for Ordinary Differential Operators.}, journal = {Numerische Mathematik}, volume = {25}, year = {1975}, pages = {201-214}, zbl = {0304.65052}, url = {http://dml.mathdoc.fr/item/GDZPPN001172727} }
Küpper, T. Einschließungsaussagen für gewöhnliche Differentialoperatoren. -Range-Domain Implications for Ordinary Differential Operators.. Numerische Mathematik, Tome 25 (1975) pp. 201-214. http://gdmltest.u-ga.fr/item/GDZPPN001172727/