V. T. Dinh, D. B. Vu, T. T. H. Truong, K. M. Nguyen, and T. T. Nguyen, “Optimal Design of a Two-Stage Helical Gear Reducer with Split Output Stage: A Multi-Objective Approach Based on NSGA-II and TOPSIS”, Eng. Technol. Appl. Sci. Res., vol. 15, no. 4, pp. 25993–26000, Aug. 2025.