Geodesic
Extremal problems for bounded analytic functions with supplementary conditions
Matematičeskie zametki, Tome 7 (1970) no. 1, pp. 63-68

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The general form of the analytic function bounded in the unit disk which maximizes the functional $$ \biggl|\sum_{j=1}^R\sum_{i=0}^{n_j}c_{ij}f^{(i)}(\tau_j)\biggr| $$ is determined. Limitations are imposed on the function in the interior of the disk. 
@article{MZM_1970_7_1_a6,
     author = {A. N. Kochetkov},
     title = {Extremal problems for bounded analytic functions with supplementary conditions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {63--68},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_1_a6/}
}
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A. N. Kochetkov. Extremal problems for bounded analytic functions with supplementary conditions. Matematičeskie zametki, Tome 7 (1970) no. 1, pp. 63-68. http://geodesic.mathdoc.fr/item/MZM_1970_7_1_a6/