Skrypnik, I. V. “Pointwise Estimates of Potentials for Higher-Order Capacities”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 1 (January 25, 1997): 149–163. Accessed April 16, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4993.