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@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/} }
Hanns-Walter Rohde. Über die Symmetrie elliptischer Differentialoperatoren.. Mathematische Zeitschrift, Tome 86 (1964), pp. 21-33. http://geodesic.mathdoc.fr/item/MZ_1964__86_170322/