D. Tjandra, M. I. Mughni, K. D. Dani, A. E. Lianto, and R. Dhelika, “Development of a High-Torque, Low-Cost Electric Bicycle with a Drivetrain Based on the Pinion-and-Pulley System”, Eng. Technol. Appl. Sci. Res., vol. 15, no. 4, pp. 25369–25375, Aug. 2025.