@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/