@article{03734268, title = {The radius of convexity of certain analytic functions. II.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {3}, year = {1980}, pages = {483-489}, doi = {10.1155/S0161171280000361}, zbl = {0468.30011}, language = {en}, url = {http://dml.mathdoc.fr/item/03734268} }
Ratti, J.S. The radius of convexity of certain analytic functions. II.. International Journal of Mathematics and Mathematical Sciences, Tome 3 (1980) pp. 483-489. doi : 10.1155/S0161171280000361. http://gdmltest.u-ga.fr/item/03734268/