Nenya, O.I. “Permanence of a Discrete Predator-Prey System With Nonmonotonic Functional Responses and Endless Delay”. Carpathian Mathematical Publications 7, no. 1 (July 6, 2015): 91–100. Accessed November 21, 2024. https://ktipe.pnu.edu.ua/index.php/cmp/article/view/1387.