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