@article{MZ_1964__86_170322,
     author = {Hanns-Walter Rohde},
     title = {\"Uber die {Symmetrie} elliptischer {Differentialoperatoren.}},
     journal = {Mathematische Zeitschrift},
     pages = {21--33},
     publisher = {mathdoc},
     volume = {86},
     year = {1964},
     zbl = {0178.13101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1964__86_170322/}
}