"Free Vibrational Effect of Foot Bridge With Compressive Forces". FULafia Journal of Science and Technology 6, no. 2 (ديسمبر 31, 2020): 12–18. تاريخ الوصول مايو 17, 2026. https://lafiascijournals.org.ng/index.php/fjst/article/view/170.