@article{GDZPPN002280418, title = {The internal problems of two dimensional potential theory}, journal = {Mathematische Annalen}, volume = {117}, year = {1940}, pages = {31-38}, zbl = {65.0422.02}, url = {http://dml.mathdoc.fr/item/GDZPPN002280418} }
Morris, R.M. The internal problems of two dimensional potential theory. Mathematische Annalen, Tome 117 (1940) pp. 31-38. http://gdmltest.u-ga.fr/item/GDZPPN002280418/