Sarana, A. A., and P. M. Tamrazov. “Contour-Solid Properties of Finely Holomorphic Functions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 50, no. 5, May 1998, pp. 712–723, https://umj.imath.kiev.ua/index.php/umj/article/view/4909.