@article{ZVMMF_2000_40_3_a4,
     author = {I. M. Prudnikov},
     title = {Lower convex approximations of {Lipschitzian} functions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {378--386},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2000_40_3_a4/}
}