@article{MZM_1988_43_5_a3,
     author = {Yu. V. Pokornyi},
     title = {An oscillation theorem of {S.} {N.~Bernshtein}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {615--623},
     year = {1988},
     volume = {43},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1988_43_5_a3/}
}