AKURO, B.-A.; OFODU, J. C. Periodic Oscillations of a Truly Nonlinear Non-Natural Oscillator. UNIPORT Journal Of Engineering and Scientific Research (UJESR), [S. l.], v. 9, n. 1, 2024. Disponível em: https://ujesr.org/index.php/ujesr/article/view/9. Acesso em: 15 sep. 2025.