Islam, Mo. Rokibul, M. Ali Akbar, B.M. Ikramul Haque, M. Samsuzzoha, Zasmin Haque, and Afroza Ali Soma. 2007. “ON FOURTH ORDER MORE CRITICALLY DAMPED NON-LINEAR SYSTEMS UNDER SOME CONDITIONS”. Khulna University Studies, May, 125-34. https://doi.org/10.53808/KUS.2007.8.1.0643-PS.