Audu , Khadeejah James, Jamiu Garba, Abdgafar Tunde Tiamiyu, and Blessing Ashiodime Thomas. 2023. “Application of Backward Differentiation Formula on Fourth-Order Differential Equations”. Journal of Science and Technology 14 (2): 52-65. https://penerbit.uthm.edu.my/ojs/index.php/JST/article/view/12395.