Huan, Tran Thien, and Ho Pham Huy Anh. “Comparative Stable Walking Gait Optimization for Small-Sized Biped Robot Using Meta-Heuristic Optimization Algorithms”. <i>Vietnam Journal of Mechanics</i>, vol. 40, no. 4, Dec. 2018, pp. 407-24, doi:10.15625/0866-7136/12294.