Mohamad, A. N., Nigussie Dedefi Waritu, Gizachew kefelew Hailu, and Mengistu Chalchisa Wakjira. 2019. “Biodiversity Strategy Improved in Ethiopia by Using Optimal Control System”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 43 (1):166-83. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/9657.