@article{MAN_1923__88_158980,
     author = {O. Haupt},
     title = {Zur {Parametrixmethode}},
     journal = {Mathematische Annalen},
     pages = {136--150},
     publisher = {mathdoc},
     volume = {88},
     year = {1923},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__88_158980/}
}