“…As a consequence, only α 1 , α 2 , α 3 , α 5 , β 1 , β 2 ,β 3 , θ 1 , θ 2 ,θ 3 ,θ 5 , θ 7 ,θ 8 need to be optimized. The preypredator optimization (PPA) algorithm [21], a most recent metaheuristic optimization technique, is adopted to find their optimal values.…”