@article{GDZPPN00240964X, title = {The Radius of Starlikeness of Certain Analytic Functions.}, journal = {Mathematische Zeitschrift}, volume = {121}, year = {1971}, pages = {351-354}, url = {http://dml.mathdoc.fr/item/GDZPPN00240964X} }
Ziegler, Michael R. The Radius of Starlikeness of Certain Analytic Functions.. Mathematische Zeitschrift, Tome 121 (1971) pp. 351-354. http://gdmltest.u-ga.fr/item/GDZPPN00240964X/