Rodríguez Flores, E.R., Rodríguez Taboada, R.E. y Gámez Díaz, R. 2004. Time evolution of fine structures of a main sunspot in the SD108 and SD284 groups. Geofísica Internacional. 43, 1 (ene. 2004), 97–101. DOI:https://doi.org/10.22201/igeof.00167169p.2004.43.1.219.