KochubeiA. N. “Linear and Nonlinear Heat Equations on a $p$ -Adic Ball”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 2 (February 25, 2018): 193-205. Accessed December 3, 2020. http://umj.imath.kiev.ua/index.php/umj/article/view/1550.