C. Fei Nging and Nik Hisyamudin Muhd Nor, “Design of Ladder Climbing Assisting Device with Simple Mechanism and Safety Equipment”, rpmme, vol. 3, no. 1, pp. 587–598, Aug. 2022, Accessed: Mar. 12, 2026. [Online]. Available: https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/4655