@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/