Geodesic
Estimates of the derivative of a~rational function
Matematičeskie zametki, Tome 13 (1973) no. 4, pp. 493-498.

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We investigate some regular rational functions on the real axis, with fixed poles, conjugate in pairs, of half-integer order. An extremal equality is obtained, which generalizes one of L. V. Taikov's results for trigonometric polynomials. 
@article{MZM_1973_13_4_a1,
     author = {V. N. Rusak},
     title = {Estimates of the derivative of a~rational function},
     journal = {Matemati\v{c}eskie zametki},
     pages = {493--498},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a1/}
}
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V. N. Rusak. Estimates of the derivative of a~rational function. Matematičeskie zametki, Tome 13 (1973) no. 4, pp. 493-498. http://geodesic.mathdoc.fr/item/MZM_1973_13_4_a1/