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@article{PORMA_1954__13_2_114732, author = {Tillmann, Heinz-G\"unther}, title = {Dualit\"at in der potentialtheorie}, journal = {Portugaliae mathematica}, pages = {55--86}, publisher = {mathdoc}, volume = {13}, number = {2}, year = {1954}, mrnumber = {0067362}, zbl = {0056.33403}, language = {de}, url = {http://geodesic.mathdoc.fr/item/PORMA_1954__13_2_114732/} }
Tillmann, Heinz-Günther. Dualität in der potentialtheorie. Portugaliae mathematica, Tome 13 (1954) no. 2, pp. 55-86. http://geodesic.mathdoc.fr/item/PORMA_1954__13_2_114732/