@article{MAN_1919__79_158792,
     author = {E. Trefftz},
     title = {Eine neue {Methode} zur {L\"osung} der {Randwertaufgabe} partieller {Differentialgleichungen.} {(Mit} 3 {Figuren} im {Test.}},
     journal = {Mathematische Annalen},
     pages = {246--264},
     publisher = {mathdoc},
     volume = {79},
     year = {1919},
     zbl = {46.0736.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1919__79_158792/}
}