ORTIZ DE ADLER, N.; ELIAS, A. G. Probable values of rise and fall off time of solar cycles 23,24, and 25. Annals of Geophysics, [S. l.], v. 39, n. 3, 1996. DOI: 10.4401/ag-3989. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3989. Acesso em: 27 nov. 2021.