@article{MZM_1972_12_1_a5,
     author = {Yu. N. Subbotin},
     title = {Approximation by splines and smooth bases in $C(0, 2\pi)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {43--51},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1972_12_1_a5/}
}