@article{MZM_1970_7_1_a3,
     author = {Yu. N. Subbotin and N. I. Chernykh},
     title = {Order of the best spline approximations of some classes of functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {31--42},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_1_a3/}
}