@article{MZM_2016_100_5_a7,
     author = {V. N. Dubinin},
     title = {An {Extremal} {Problem} for the {Derivative} of a {Rational} {Function}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {732--738},
     publisher = {mathdoc},
     volume = {100},
     number = {5},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2016_100_5_a7/}
}