Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1969__5_4_a7, author = {Schubert, Hans}, title = {Einige {Hilfss\"atze} der ebenen {Potentialtheorie}}, journal = {Archivum mathematicum}, pages = {215--225}, publisher = {mathdoc}, volume = {05}, number = {4}, year = {1969}, mrnumber = {0289798}, zbl = {0231.31001}, language = {ge}, url = {http://geodesic.mathdoc.fr/item/ARM_1969__5_4_a7/} }
Schubert, Hans. Einige Hilfssätze der ebenen Potentialtheorie. Archivum mathematicum, Tome 05 (1969) no. 4, pp. 215-225. http://geodesic.mathdoc.fr/item/ARM_1969__5_4_a7/