DvornykA. V., StrukO. O., and TkachenkoV. I. “Almost Periodic Solutions of Lotka – Volterra systems With Diffusion and Impulsive Action”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 70, no. 2, Feb. 2018, pp. 177-92, http://umj.imath.kiev.ua/index.php/umj/article/view/1549.