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References
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Jackson D., “On approximation by trigonometric sums and polynomials”, Trans. Amer. Math. Soc., 13 (1912), 491–515    |
| 2. |
Zygmund A., “Smooth Functions”, Duke Math. J., 12:1 (1945), 47–76 |
| 3. |
Stechkin S. B., “On the best approximation of periodic functions by trigonometric polynomials”, Dokl. Akad. Nauk SSSR, 83:5 (1952), 651–654 |
| 4. |
Kopotun K. A., “Uniform estimates of the coconvex approximation of functions by polynomials”, Math. Notes, 51:3 (1992), 245–254   |
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Timan A. F., “The strengthening of the theorem of Jackson on the best approximation of continuous functions on a finite interval of the real axis”, Dokl. Akad. Nauk SSSR, 78:1 (1951), 17–20 |
| 6. |
Dzyadyk V. K., “On the approximation of functions by ordinary polynomials on a finite interval of the real axis”, Izvestiia AN SSSR. Ser. matematicheskaia, 22:3 (1958), 337–354 |
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Freud G., “Uber die Approximation Reelen Stetiger Functionen Durch Gewohnliche Polinome”, Math. Ann., 137:1 (1959), 17–25 |
| 8. |
Teljakovskii S. A., “Two theorems on approximation of functions by algebraic polynomials”, Mat. Sb. (N.S.), 70(112):2 (1966), 252–265 |
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Brudnyi Yu. A., “The approximation of functions by algebraic polynomials”, Mathematics of the USSR-Izvestiya, 2:4 (1968), 735–743  |
| 10. |
Lorentz G. G., Zeller K. L., “Degree of Approximation by Monotone Polynomials. II”, J. Approx. Theory, 2:3 (1969), 265–269 |
| 11. |
Shevchuk I. A., Approximation by polynomials and traces continuous on the interval functions, Naukova dumka, Kiev, 1992, 225 pp. (in Russian) |
| 12. |
Shvedov A. S., “Jackson's theorem in $L^p$, $0\lt p\lt 1$, for algebraic polynomials, and orders of comonotone approximations”, Math. Notes, 25:1 (1979), 57–63 |
| 13. |
Shvedov A. S., “Comonotone approximation of functions by polynomials”, Dokl. Akad. Nauk SSSR, 250:1 (1980), 39–42 |
| 14. |
Dzyadyk V. K., Introduction to the theory of uniform approximation of functions by polynomials, Nauka, Moscow, 1977, 512 pp. (in Russian) |
