SavchukV. V., SavchukM. V., & ChaichenkoS. O. (2019). Approximation of bounded holomorphic and harmonic functions by Fejér means. Ukrains’kyi Matematychnyi Zhurnal, 71(4), 516-542. Retrieved from http://umj.imath.kiev.ua/index.php/umj/article/view/1455