Berezovs’kyi, M. A. “One-Dimensional Problems With Free Boundaries in Ecology”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 7 (July 25, 1997): 993–997. Accessed May 19, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/5091.