Tafur Charry, M. P., A. Gaviria, M. Ortigoza, L. Losada, and K. L. Vargas. “Variants Applied to the Control Scheme in Mining Companies in Ínquira – Huila”. The International Social Sciences Review, Vol. 1, July 2019, pp. 43-57, https://journals.eagora.org/SOCIALrev/article/view/1445.