@article{1077465189,
author = {Duffin, R. J.},
title = {Discrete potential theory},
journal = {Duke Math. J.},
volume = {20},
number = {1},
year = {1953},
pages = { 233-251},
language = {en},
url = {http://dml.mathdoc.fr/item/1077465189}
}
Duffin, R. J. Discrete potential theory. Duke Math. J., Tome 20 (1953) no. 1, pp. 233-251. http://gdmltest.u-ga.fr/item/1077465189/