F.ALFAOURI, Mikhled. Power Spectral Analysis of Signal with Time-Varying Characteristics. Al-Balqa Journal for Research and Studies, [S. l.], v. 5, n. 1, p. 41–60, 1997. Disponível em: https://ajrs.ammanu.edu.jo/ojs/index.php/albalqajournal/article/view/502.. Acesso em: 11 oct. 2026.