Bittiev KR. Space-time localization in one-dimensional problems with free boundary for nonlinear second-order equations. Ukr. Mat. Zhurn. [Internet]. 1998 Nov. 25 [cited 2025 Dec. 5];50(11):1554–1558. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4808