Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1971_109_a3, author = {Yu. N. Subbotin}, title = {Approximation by spline functions, and estimates of widths}, journal = {Informatics and Automation}, pages = {35--60}, publisher = {mathdoc}, volume = {109}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_109_a3/} }
Yu. N. Subbotin. Approximation by spline functions, and estimates of widths. Informatics and Automation, Приближение периодических функций, Tome 109 (1971), pp. 35-60. http://geodesic.mathdoc.fr/item/TRSPY_1971_109_a3/