@article{1028999185,
author = {Robertson, M. S.},
title = {An extremal problem for functions with positive real part.},
journal = {Michigan Math. J.},
volume = {11},
number = {1},
year = {1964},
pages = { 327-335},
language = {en},
url = {http://dml.mathdoc.fr/item/1028999185}
}
Robertson, M. S. An extremal problem for functions with positive real part.. Michigan Math. J., Tome 11 (1964) no. 1, pp. 327-335. http://gdmltest.u-ga.fr/item/1028999185/