1. S. Ya. Khavinson, “On a concept of completeness that takes account of the absolute values of the coefficients of the approximating polynomials,” Izv. Akad. Nauk Arm. SSR, Ser. Mat.,6, Nos. 2–3, 222–234 (1971).
2. J. D. Stafney, “A permissible restriction on the coefficients in uniform polynomial approximation to C[0, 1],” Duke Math. J.,34, No. 3, 393–396 (1967).
3. S. Ya. Khavinson, “Admissible absolute values of the coefficients of the polynomials in uniform approximation of continuous functions,” Mat. Zametki,6, No. 5, 619–625 (1969).
4. V. I. Gurarii and M. A. Meletidi, “On estimates of the coefficients of polynomials approximating continuous functions,” Funkts. Analiz Prilozhen.,5, No. 1, 73–75 (1971).
5. O. A. Muradyan, “On the growth of the coefficients of the approximating aggregates in Muntz's theorem,” Izv. Akad. Nauk Arm. SSR, Ser. Mat.,8, No. 1, 70–87 (1973).