Berezovsky, A. A., Yu. A. Mitropolskiy, and M. Kh. Shkhanukov-Lafishev. 2005. “Finite-Time Stabilization in Problems With Free Boundary for Nonlinear Equations in Media With Fractal Geometry”. Ukrains’kyi Matematychnyi Zhurnal 57 (7), 997–1001. https://umj.imath.kiev.ua/index.php/umj/article/view/3658.