AMER, W. S. On the Harmonic Oscillations for the Motion of a Dynamical System. JOURNAL OF ADVANCES IN PHYSICS, [S. l.], v. 13, n. 2, p. 4657–4670, 2017. DOI: 10.24297/jap.v13i2.5754. Disponível em: https://rajpub.com/index.php/jap/article/view/5754. Acesso em: 13 may. 2024.