KovtonyukD. A., PetkovI. V., & RyazanovV. I. (2012). On the Dirichlet problem for the Beltrami equations in finitely connected domains. Ukrains’kyi Matematychnyi Zhurnal, 64(7), 932-944. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/2629