Pérez Enríquez, R., Miroshnichenko, L., Rodríguez Taboada, R. E. and Méndez Berhondo, A. (2000) “Solar-terrestrial response to large extension or long-duration solar gamma ray events”, Geofisica Internacional, 39(1), pp. 87–92. doi: 10.22201/igeof.00167169p.2000.39.1.301.