@article{MAN_1939__116_160006,
     author = {R.M. Morris},
     title = {The internal problems of two-dimensional potential theory},
     journal = {Mathematische Annalen},
     pages = {374--400},
     publisher = {mathdoc},
     volume = {116},
     year = {1939},
     zbl = {65.0422.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1939__116_160006/}
}