IQBAL, Waseem; SHOAIB, Muhammad; AHMAD, Jameel; BUTT, Muhammad Asim; KHALID, Abdullah; ADNAN, Muhammad. Parametric and Non-Parametric Spectral Signal Processing Techniques for Estimation of Periodicity in Sunspot Numbers: Spectral signal processing techniques for estimation of preiodcity in sun spot numbers. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, [S. l.], v. 56, n. 1, p. 9–20, 2021. Disponível em: http://ppaspk.org/index.php/PPAS-A/article/view/146. Acesso em: 4 dec. 2025.