@article{GDZPPN002269120, title = {Zur Parametrixmethode}, journal = {Mathematische Annalen}, volume = {90}, year = {1923}, pages = {136-150}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN002269120} }
Haupt, O. Zur Parametrixmethode. Mathematische Annalen, Tome 90 (1923) pp. 136-150. http://gdmltest.u-ga.fr/item/GDZPPN002269120/