DE HARO BARBAS, B. F.; ELIAS, A. G. On the inclusion of data from solar cycle 19 to estimate F2 layer characteristic long term trends. Annals of Geophysics, [S. l.], v. 58, n. 4, p. A0441, 2015. DOI: 10.4401/ag-6676. Disponível em: https://www.annalsofgeophysics.eu/index.php/annals/article/view/6676. Acesso em: 25 sep. 2022.