Méndez Berhondo, Adolfo L., Ramón E. Rodríguez Taboada, and Asdai Díaz Rodríguez. 2000. “Characterization of Two Solar Active Regions by Activity in the Radio Range”. Geofisica Internacional 39 (2):201-3. https://doi.org/10.22201/igeof.00167169p.2000.39.2.277.