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@article{MOMA_1974__78_186321, author = {Werner Kratz}, title = {Zur {Unl\"osbarkeit} linearer partieller {Differentialgleichungen.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {223--228}, publisher = {mathdoc}, volume = {78}, year = {1974}, zbl = {0288.35007}, url = {http://geodesic.mathdoc.fr/item/MOMA_1974__78_186321/} }
Werner Kratz. Zur Unlösbarkeit linearer partieller Differentialgleichungen.. Monatshefte für Mathematik, Tome 78 (1974), pp. 223-228. http://geodesic.mathdoc.fr/item/MOMA_1974__78_186321/