Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1992_51_6_a15, author = {V. T. Shevaldin}, title = {Widths of classes of convolutions with {Poisson} kernel}, journal = {Matemati\v{c}eskie zametki}, pages = {126--136}, publisher = {mathdoc}, volume = {51}, number = {6}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_6_a15/} }
V. T. Shevaldin. Widths of classes of convolutions with Poisson kernel. Matematičeskie zametki, Tome 51 (1992) no. 6, pp. 126-136. http://geodesic.mathdoc.fr/item/MZM_1992_51_6_a15/