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 December 21, 2024. https://journals.vilniustech.lt/index.php/MMA/article/view/870.