Can Chulim, Álvaro. “Evaluation of the Sodium Adsorption Ratio in Waters of the Tulancingo River, State of Hidalgo, Mexico”. REVISTA TERRA LATINOAMERICANA, vol. 26, no. 3, Sept. 2008, pp. 243-52, https://terralatinoamericana.org.mx/index.php/terra/article/view/1348.