de la Cruz-Durán, Jairo Aarón. “Spectral Indexes in Sweet Pepper for Diagnosis of Nitrogen Nutrient Status”. REVISTA TERRA LATINOAMERICANA 29, no. 3 (September 1, 2011): 259–265. Accessed September 8, 2025. http://mail.terralatinoamericana.org.mx/index.php/terra/article/view/1174.