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@article{MZ_1957__67_169651, author = {Wolfgang Walter}, title = {Verallgemeinerte {Laplace-Operatoren} und {Potentiale.}}, journal = {Mathematische Zeitschrift}, pages = {38--48}, publisher = {mathdoc}, volume = {67}, year = {1957}, zbl = {0078.09202}, url = {http://geodesic.mathdoc.fr/item/MZ_1957__67_169651/} }
Wolfgang Walter. Verallgemeinerte Laplace-Operatoren und Potentiale.. Mathematische Zeitschrift, Tome 67 (1957), pp. 38-48. http://geodesic.mathdoc.fr/item/MZ_1957__67_169651/