@article{ZVMMF_2002_42_8_a4,
     author = {E. G. Zhilyakov and Yu. A. Fokin},
     title = {A variational technique for estimating derivates of empirical functions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1138--1143},
     publisher = {mathdoc},
     volume = {42},
     number = {8},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2002_42_8_a4/}
}