@article{MZM_1994_55_5_a14,
     author = {A. Yu. Shadrin},
     title = {Letter to the editor about {A.\,I.~Zvyagintsev's} paper {``Extremal} problem on the norm of an intermediate derivative''},
     journal = {Matemati\v{c}eskie zametki},
     pages = {154--156},
     publisher = {mathdoc},
     volume = {55},
     number = {5},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_55_5_a14/}
}