Méndez Berhondo, A.L., Rodríguez Taboada, R.E. y Díaz Rodríguez, A. 2000. Characterization of two solar active regions by activity in the radio range. Geofísica Internacional. 39, 2 (abr. 2000), 201–203. DOI:https://doi.org/10.22201/igeof.00167169p.2000.39.2.277.