@article{GDZPPN002345226,
title = {The theorem of Enestr\"om and the extremal functions of Landau-Schur},
journal = {Mathematica Scandinavica},
volume = {5},
year = {1957},
pages = {236-240},
zbl = {0081.07103},
url = {http://dml.mathdoc.fr/item/GDZPPN002345226}
}
WINTNER, AUREL. The theorem of Eneström and the extremal functions of Landau-Schur. Mathematica Scandinavica, Tome 5 (1957) pp. 236-240. http://gdmltest.u-ga.fr/item/GDZPPN002345226/