Mat Yahya, N., Yusoff, A.R., Senawi, A. and Tokhi, M.O. 2019. Dual Level Searching Approach for Solving Multi Objective Optimisation Problems using Hybrid Particle Swarm Optimisation and Bats Echolocation-inspired Algorithms. Mekatronika: Journal of Intelligent Manufacturing and Mechatronics. 1, 1 (Jan. 2019), 45–57.