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@article{MZ_1972__126_171727, author = {G\'eza Freud}, title = {On {Direct} and {Converse} {Theorems} in the {Theory} of {Weighted} {Poynomial} {Approximation.}}, journal = {Mathematische Zeitschrift}, pages = {123--134}, publisher = {mathdoc}, volume = {126}, year = {1972}, zbl = {0222.41004}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__126_171727/} }
Géza Freud. On Direct and Converse Theorems in the Theory of Weighted Poynomial Approximation.. Mathematische Zeitschrift, Tome 126 (1972), pp. 123-134. http://geodesic.mathdoc.fr/item/MZ_1972__126_171727/