García-Ulacia, I., and M. A. Fernández-Labrada. “Identification of the Model and Controlling Step in Acid Liquor Neutralization Process at the Nickel Processing Industry”. Minería & Geología, vol. 31, no. 1, Mar. 2015, pp. 80-97, https://revista.ismm.edu.cu/index.php/revistamg/article/view/929.