C. L. EJIKEME; M. O. OYESANYA; D. F. AGBEBAKU; M. B. OKOFU. Discussing a Solution to Nonlinear Duffing Oscillator with Fractional Derivatives Using Homotopy Analysis Method (HAM). Theory and Practice of Mathematics and Computer Science Vol. 6, [S. l.], p. 57–81, 2021. DOI: 10.9734/bpi/tpmcs/v6/3966D. Disponível em: https://stm.bookpi.org/TPMCS-V6/article/view/59. Acesso em: 20 jul. 2026.