Geodesic
The application of the area principle to the Bieberbach--Eilenberg functions
Matematičeskie zametki, Tome 11 (1972) no. 6, pp. 609-618

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A series of inequalities are obtained for the logarithmic areas of functions of the form $f(z)=\sum_{k=1}^\infty a_kz^k$ and $\varphi(z)=\frac{R}2+\sum_{k=0}^\infty a'_kz^k$, univalent in the circle $|z|1$, and also for the Taylor coefficients of the Bieberbach–Eilenberg functions. 
@article{MZM_1972_11_6_a0,
     author = {A. Z. Grinshpan},
     title = {The application of the area principle to the {Bieberbach--Eilenberg} functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {609--618},
     publisher = {mathdoc},
     volume = {11},
     number = {6},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_11_6_a0/}
}
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A. Z. Grinshpan. The application of the area principle to the Bieberbach--Eilenberg functions. Matematičeskie zametki, Tome 11 (1972) no. 6, pp. 609-618. http://geodesic.mathdoc.fr/item/MZM_1972_11_6_a0/