Blanco–Macías, F., R. Magallanes–Quintanar, R. E. Vázquez–Alvarado, S. de J. Méndez–Gallegos, E. Troyo–Diéguez, C. Gallegos-Vázquez, and R. D. Valdez–Cepeda. “Opuntia ficus–indica (L.) Mill. Yield Depends on Nutrients and Nutrient Ratios”. Journal of the Professional Association for Cactus Development, vol. 13, Jan. 2011, pp. 1-9, doi:10.56890/jpacd.v13i.84.