@article{MZM_1990_47_6_a9,
     author = {E. I. Ostrovskii},
     title = {A~refinement of {S.} {N.~Bernstein's} inequality},
     journal = {Matemati\v{c}eskie zametki},
     pages = {80--84},
     year = {1990},
     volume = {47},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_47_6_a9/}
}