N. Mat Yahya, A. R. Yusoff, A. Senawi, and M. O. Tokhi, “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., vol. 1, no. 1, pp. 45–57, Jan. 2019.