P. Sierra-Figueredo, E. A. Marinero-Orantes, Ángel Sol-Sánchez, and C. A. Zúniga-Gonzalez, “Cane sugar production in El Salvador and its relationship with the variability of Solar and Geomagnetic Activity: An approach to Bio economics and Climate Change”, Rev. iberoam. bioecon. cambio clim., vol. 5, no. 10, pp. 1209–1221, Dec. 2019.