Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1980_145_a1, author = {V. M. Badkov}, title = {Approximation of functions in a~uniform metric by {Fourier} sums in orthogonal polynomials}, journal = {Informatics and Automation}, pages = {20--62}, publisher = {mathdoc}, volume = {145}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1980_145_a1/} }
V. M. Badkov. Approximation of functions in a~uniform metric by Fourier sums in orthogonal polynomials. Informatics and Automation, Approximation of functions by polynomials and splines, Tome 145 (1980), pp. 20-62. http://geodesic.mathdoc.fr/item/TRSPY_1980_145_a1/