Kamarudin, Ahmad Fahmy, Azmi Ibrahim, Shahrul Niza Mokhatar, Mohd Hazreek Zainal Abidin, and Ade Faisal. 2020. “Dynamic Characteristics Evaluation on Portable Steel Frame Against Vertical Mass Irregularities”. International Journal of Integrated Engineering 12 (9): 27-35. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/5528.