Anharmonic oscillator via Legendre and Chebyshev pseudo-spectral methods. Advances in the Theory of Nonlinear Analysis and its Application, [S. l.], v. 7, n. 5, p. 66–80, 2023. DOI: 10.17762/atnaa.v7.i5.326. Disponível em: https://atnaea.org/index.php/journal/article/view/326.. Acesso em: 3 apr. 2026.