Mat Yahya, N.; Yusoff, A. R.; Senawi, A.; Tokhi, M. O. Dual Level Searching Approach for Solving Multi Objective Optimisation Problems Using Hybrid Particle Swarm Optimisation and Bats Echolocation-Inspired Algorithms. Mekatronika: J. Intell. Manuf. Mechatron. 2019, 1, 45-57.