Blanco-Solano, J., N. Kagan, C. F. Almeida, J. Petit-Suárez, and G. Ordóñez-Plata. “Voltage Sag State Estimation Based on l_1-Norm Minimization Methods in Radial Electric Power Distribution System”. Revista UIS Ingenierías, vol. 17, no. 2, May 2018, pp. 309-18, doi:10.18273/revuin.v17n2-2018026.