Adah, E. ., D. Onwuka, O. Ibearugbulem, and C. . Okere. “LINEAR AND NONLINEAR FREE VIBRATION ANALYSIS OF RECTANGULAR PLATE”. Journal of Civil Engineering, Science and Technology, vol. 12, no. 1, Apr. 2021, pp. 15-25, doi:10.33736/jcest.3338.2021.