@article{MZM_1977_21_3_a7,
     author = {A. Khatamov},
     title = {Rational approximations of convex functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {355--370},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a7/}
}