@article{1183498782,
author = {Walsh, J. L.},
title = {A necessary condition for approximation by rational functions},
journal = {Bull. Amer. Math. Soc.},
volume = {42},
number = {12},
year = {1936},
pages = { 219-221},
language = {en},
url = {http://dml.mathdoc.fr/item/1183498782}
}
Walsh, J. L. A necessary condition for approximation by rational functions. Bull. Amer. Math. Soc., Tome 42 (1936) no. 12, pp. 219-221. http://gdmltest.u-ga.fr/item/1183498782/