BazaliiB. V., and KrasnoshchokM. V. “On One Problem With Free Boundary for a Nonlinear System”. Ukrains’kyi Matematychnyi Zhurnal 48, no. 9 (September 25, 1996): 1155–1165. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5231.