1. Generalizations of a theorem of A. F. Timan;Brudnyi;Soviet Math. Dokl.,1963
2. Pointwise approximation by polynomials and splines;De Vore,1977
3. Pointwise estimations of approximations by algebraic polynomials;Gonska;Acta Math. Hungar.,1985
4. A theorem of A. F. Timan on the approximation of functions by polynomials on a finite segment;Gopengauz;Mat. Zametki,1967
5. A question concerning the approximation of functions on a segment and a region with corners;Gopengauz;Theor. Funkcii Funkcional. Anal. Pril.,1967