@article{MAN_1933__107_159576,
     author = {St. Warschawski},
     title = {Bemerkungen \"uber {Randableitungen} positiver {Potentialfunktionen}},
     journal = {Mathematische Annalen},
     pages = {1--27},
     publisher = {mathdoc},
     volume = {107},
     year = {1933},
     zbl = {0005.29501},
     url = {http://geodesic.mathdoc.fr/item/MAN_1933__107_159576/}
}