Solution of the Kolmogorov-Nikol’skii problem for three-harmonic Poisson integrals on classes $C^{\psi}_{\beta,\infty}$. ЗПІМ [Internet]. 2014 Jun. 24 [cited 2026 Sep. 9];11(3):104-27. Available from: https://trim.imath.kiev.ua/index.php/trim/article/view/70