IDRIS, M. D. F. B. and Esa, M. F. . (2021) “Design, Analysis and Optimization Using Solidwork Simulation of Chair Ladder”, Progress in Engineering Application and Technology, 2(2), pp. 947–957. Available at: https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/946 (Accessed: 28 June 2022).