@article{bwmeta1.element.bwnjournal-article-smv34i1p15bwm, author = {E. M\"uller-Pfeiffer}, title = {Spektraleigenschaften eindimensionaler Differentialoperatoren h\"oherer Ordnung}, journal = {Studia Mathematica}, volume = {34}, year = {1970}, pages = {183-196}, zbl = {0199.20801}, language = {deu}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv34i1p15bwm} }
Müller-Pfeiffer, E. Spektraleigenschaften eindimensionaler Differentialoperatoren höherer Ordnung. Studia Mathematica, Tome 34 (1970) pp. 183-196. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv34i1p15bwm/