Geodesic
An upper bound for the least critical values of finite Blaschke products
Sbornik. Mathematics, Tome 213 (2022) no. 6, pp. 744-751

Voir la notice de l'article provenant de la source Math-Net.Ru

For the finite Blaschke products $B$ of degree $n\geqslant2$ such that $B(0)=0$ and $ B'(0)\ne0$, the supremum of the minimum moduli of their critical values is found which depends only on $n$ and $|B'(0)|$. Bibliography: 12 titles.
Keywords: rational functions, Blaschke products, critical values, Riemann surfaces, dissymmetrization. 
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     author = {V. N. Dubinin},
     title = {An upper bound for the least critical values of finite {Blaschke} products},
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V. N. Dubinin. An upper bound for the least critical values of finite Blaschke products. Sbornik. Mathematics, Tome 213 (2022) no. 6, pp. 744-751. http://geodesic.mathdoc.fr/item/SM_2022_213_6_a1/