Cai, Jingjing, and Quanjun Wu. “Asymptotic Behavior for Radially Symmetric Solutions of a Logistic Equation With a Free Boundary”. Mathematical Modelling and Analysis 22, no. 1 (January 11, 2017): 21-36. Accessed November 18, 2024. https://jeelm.vgtu.lt/index.php/MMA/article/view/870.