@article{ISU_2006_6_1-2_a5,
     author = {E. V. Shishkova},
     title = {Exact orders of errors in smooth functions approximations},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {45--57},
     year = {2006},
     volume = {6},
     number = {1-2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2006_6_1-2_a5/}
}