@article{MAN_1959__139_160749,
     author = {H. Beckert},
     title = {Eine bemerkenswerte {Eigenschaft} der {L\"osungen} des {Dirichletschen} {Problems} bei linearen elliptischen {Differentialgleichungen.}},
     journal = {Mathematische Annalen},
     pages = {255--264},
     publisher = {mathdoc},
     volume = {139},
     year = {1959},
     zbl = {0095.30402},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__139_160749/}
}