NguyenD. T. and PhamV. D. (2004) “On the degree of holomorphic mappings from an annulus into an annulus”, Ukrains’kyi Matematychnyi Zhurnal, 56(8), pp. 1135–1138. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3828 (Accessed: 27July2024).