BorzdykoV. I. (2010) “Periodic solutions of ‘predator–prey’ systems with continuous delay and periodic coefficients”, Ukrains’kyi Matematychnyi Zhurnal, 62(1), pp. 15 - 28. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2840 (Accessed: 23November2024).