@article{1077474297,
author = {Walsh, J. L.},
title = {The location of the critical points of simply and doubly
periodic functions},
journal = {Duke Math. J.},
volume = {14},
number = {1},
year = {1947},
pages = { 575-586},
language = {en},
url = {http://dml.mathdoc.fr/item/1077474297}
}
Walsh, J. L. The location of the critical points of simply and doubly
periodic functions. Duke Math. J., Tome 14 (1947) no. 1, pp. 575-586. http://gdmltest.u-ga.fr/item/1077474297/