“…Several exact methods are studied in the literature [2][3][4] but these methods can solve only small-size problems. Thus, heuristic methods such as Simulated Annealing [5,6], Genetic Algorithm [6,7], Tabu Search [6], Variable Neighborhood Search [3,6], Ant Colony [7][8][9] and Particle Swarm Optimization [10] are proposed for the WTA.…”