@article{1077474481, author = {Gergen, J. J. and Dressel, F. G.}, title = {A minimal problem for harmonic functions}, journal = {Duke Math. J.}, volume = {14}, number = {1}, year = {1947}, pages = { 889-906}, language = {en}, url = {http://dml.mathdoc.fr/item/1077474481} }
Gergen, J. J.; Dressel, F. G. A minimal problem for harmonic functions. Duke Math. J., Tome 14 (1947) no. 1, pp. 889-906. http://gdmltest.u-ga.fr/item/1077474481/