Baltazar Vera, J. C., et al. “Energy Response of Dispersed Red 1 Azo Dye Mixed With Reduced Graphene and Graphene Oxide in Sensitized Solar Cells”. Acta Universitaria, vol. 28, no. 3, Aug. 2018, pp. 9-16, https://doi.org/10.15174/au.2018.1469.