@article{DAN_1962_144_3_a1,
     author = {G. A. Bessmertnykh and A. Yu. Levin},
     title = {Some bounds for differentiable functions of one variable},
     journal = {Doklady Akademii Nauk},
     pages = {471--474},
     publisher = {mathdoc},
     volume = {144},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_3_a1/}
}