C. L. Ejikeme, M. O. Oyesanya, D. F. Agbebaku and M. B. Okofu. Discussing a Solution to Nonlinear Duffing Oscillator with Fractional Derivatives Using Homotopy Analysis Method (HAM). TPMCS-V6 [Internet]. 2021 Feb. 6 [cited 2026 Jun. 4];:57-81. Available from: https://stm.bookpi.org/TPMCS-V6/article/view/59