Liu, Pengyan, Liang Zhang, Shitao Liu, and Lifei Zheng. “Global Exponential Stability of Almost Periodic Solutions for Nicholson’s Blowflies System With Nonlinear Density-Dependent Mortality Terms and Patch Structure”. Mathematical Modelling and Analysis 22, no. 4 (July 3, 2017): 484-502. Accessed September 19, 2021. https://journals.vgtu.lt/index.php/MMA/article/view/908.