AL FADHEL, Safia Abdullah; AL-KHADIR, Amal Al-Ser; AL - ZOBAIE, Obeid Mahmoud Mohsen. Modeling the Gas price data Using Periodogram and Fourier Series Analysis. Journal of natural sciences, life and applied sciences, New Mexico, United States, v. 3, n. 1, p. 37–23, 2019. DOI: 10.26389/AJSRP.F300119. Disponível em: https://ajsrp.ojsexpert.com/index.php/jnslas/article/view/1000. Acesso em: 20 dec. 2025.