Bakhtin, A.K. and V'yun, V.E. (2007) “Application of a separating transformation to estimates of inner radii of open sets”, Ukrains’kyi Matematychnyi Zhurnal, 59(10), pp. 1313–1321. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3390 (Accessed: 5 December 2025).