Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1989_189_a9, author = {V. T. Shevaldin}, title = {Lower bounds on widths of classes of sourcewise representable functions}, journal = {Informatics and Automation}, pages = {185--200}, publisher = {mathdoc}, volume = {189}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1989_189_a9/} }
V. T. Shevaldin. Lower bounds on widths of classes of sourcewise representable functions. Informatics and Automation, A work collection of the All-Union school on function theory, Tome 189 (1989), pp. 185-200. http://geodesic.mathdoc.fr/item/TRSPY_1989_189_a9/