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2. Approximation of continuous functions with the aid of polynomials;Mirakjan;Doklady Akademii Nauk SSSR,1941
3. Generalization of S. Bernstein's polynomials to the infinite interval;Szász;Journal of Research of the National Bureau of Standards,1950
4. A theory of interpolation of normed spaces;Peetre;Notas de Matematica, Rio de Janeiro,1968
5. Inequalities connected with moduli of smoothness;Johnen;Matematicki Vesnik,1972