@article{1183501909,
author = {Walsh, J. L.},
title = {Note on the location of zeros of the derivative of a rational function whose zeros and poles are symmetric in a circle},
journal = {Bull. Amer. Math. Soc.},
volume = {45},
number = {11},
year = {1939},
pages = { 462-470},
language = {en},
url = {http://dml.mathdoc.fr/item/1183501909}
}
Walsh, J. L. Note on the location of zeros of the derivative of a rational function whose zeros and poles are symmetric in a circle. Bull. Amer. Math. Soc., Tome 45 (1939) no. 11, pp. 462-470. http://gdmltest.u-ga.fr/item/1183501909/