V. I. Danchenko, D. G. Chkalova, “Bernstein-type estimates for the derivatives of trigonometric polynomials”, Probl. anal. Issues Anal., 10(28):3 (2021), 31–40;
V. I. Danchenko, D. G. Chkalova, “Algebraic analogs of Fejer inequalities”, J. Math. Sci., 255:5 (2021), 601–608 https://link.springer.com/article/10.1007/s10958-021-05397-0
D. G. Vasilchenkova, V. I. Danchenko, “Extraction of harmonics from trigonometric polynomials by phase-amplitude operators”, St. Petersburg Math. J., 32:2 (2021), 215–232
D. G. Vasilchenkova, V. I. Danchenko, “Extraction of Several Harmonics from Trigonometric Polynomials. Fejér-Type Inequalities”, Proc. Steklov Inst. Math., 308 (2020), 92–106
V. I. Danchenko, D. G. Chkalova, “Bernstein-type estimates for the derivatives of trigonometric polynomials”, Probl. anal. Issues Anal., 10(28):3 (2021), 31–40
2.
V. I. Danchenko, D. G. Chkalova, “Algebraic analogs of Fejer inequalities”, J. Math. Sci., 255:5 (2021), 601–608 https://link.springer.com/article/10.1007/s10958-021-05397-0
D. G. Vasilchenkova, V. I. Danchenko, “Extraction of harmonics from trigonometric polynomials by phase-amplitude operators”, St. Petersburg Math. J., 32:2 (2021), 215–232
4.
D. G. Vasilchenkova, V. I. Danchenko, “Extraction of Several Harmonics from Trigonometric Polynomials. Fejér-Type Inequalities”, Proc. Steklov Inst. Math., 308 (2020), 92–106;