@article{MZ_1971__122_171611,
     author = {Michael R. Ziegler},
     title = {The {Radius} of {Starlikeness} of {Certain} {Analytic} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {351--354},
     publisher = {mathdoc},
     volume = {122},
     year = {1971},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__122_171611/}
}