López-López, Miguel Ángel. “Detection of Iron Deficiencies in Pinus Leiophylla from Nutrient Dilution-and-Concentration Effects”. REVISTA TERRA LATINOAMERICANA, vol. 25, no. 1, Mar. 2007, pp. 009-15, https://terralatinoamericana.org.mx/index.php/terra/article/view/1433.