Bakhtin, A. K., I. Ya. Dvorak, and Ya. V. Zabolotnyi. 2017. “Estimates of the Product of Inner Radii of Five Nonoverlapping Domains”. Ukrains’kyi Matematychnyi Zhurnal 69 (2): 261-67. https://umj.imath.kiev.ua/index.php/umj/article/view/1691.