@article{04154813, title = {A note on neighborhoods of analytic functions having positive real part.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {425-430}, doi = {10.1155/S0161171290000643}, zbl = {0704.30019}, language = {en}, url = {http://dml.mathdoc.fr/item/04154813} }
Walker, Janice B. A note on neighborhoods of analytic functions having positive real part.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 425-430. doi : 10.1155/S0161171290000643. http://gdmltest.u-ga.fr/item/04154813/