A., Oswaldo. “Seasonal, Diurnal, and Within Canopy Variation of Leaf Nitrogen Compounds in Almond and Nectarine Leaves”. REVISTA TERRA LATINOAMERICANA, vol. 27, no. 3, Sept. 2009, pp. 187-96, https://mail.terralatinoamericana.org.mx/index.php/terra/article/view/1281.