Geodesic
A rotation theorem for the class of univalent $p$-symmetric functions
Matematičeskie zametki, Tome 10 (1971) no. 2, pp. 239-242 
V. Ya. Gutlyanskii. A rotation theorem for the class of univalent $p$-symmetric functions. Matematičeskie zametki, Tome 10 (1971) no. 2, pp. 239-242. http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a13/
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     author = {V. Ya. Gutlyanskii},
     title = {A rotation theorem for the class of univalent $p$-symmetric functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {239--242},
     year = {1971},
     volume = {10},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a13/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Exact estimates are obtained for the argument of the derivative on the class of all univalent holomorphic $p$-symmetric functions in the unit disk.