@article{GDZPPN002282712, title = {Zur Theorie der partiellen Differentialgleichungen.}, journal = {Mathematische Annalen}, volume = {124}, year = {1951}, pages = {148-150}, zbl = {0046.10303}, url = {http://dml.mathdoc.fr/item/GDZPPN002282712} }
Hornich, H. Zur Theorie der partiellen Differentialgleichungen.. Mathematische Annalen, Tome 124 (1951) pp. 148-150. http://gdmltest.u-ga.fr/item/GDZPPN002282712/