@article{05231596, title = {On error formulas for approximation by sums of univariate functions.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2006}, year = {2006}, doi = {10.1155/IJMMS/2006/65620}, zbl = {1156.41314}, language = {en}, url = {http://dml.mathdoc.fr/item/05231596} }
Ismailov, Vugar E. On error formulas for approximation by sums of univariate functions.. International Journal of Mathematics and Mathematical Sciences, Tome 2006 (2006) . doi : 10.1155/IJMMS/2006/65620. http://gdmltest.u-ga.fr/item/05231596/