AbdullayevF. G., and ÖzkartepeN. P. 2012. “On the Improvement of the Rate of Convergence of the Generalized Bieberbach Polynomials in Domains With Zero Angles”. Ukrains’kyi Matematychnyi Zhurnal 64 (5), 582-96. https://umj.imath.kiev.ua/index.php/umj/article/view/2599.