@article{MZM_1990_48_4_a10,
     author = {Sun Yong-sheng and Li Chun},
     title = {Best approximation of certain classes of smooth functions on the real axis by splines of a~higher order},
     journal = {Matemati\v{c}eskie zametki},
     pages = {100--109},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_4_a10/}
}