Sufyan A. Wuhaib, Bilal A. Yaseen. SIS MODEL WITH HARVESTING IN FOOD CHAIN MODEL. Tikrit J. Pure Sci. [Internet]. 2020 Feb. 2 [cited 2024 May 18];25(1):108-17. Available from: https://tjps.tu.edu.iq/index.php/tjps/article/view/220