Quispe, J. C., J. Morales, and E. Orduña. “Ultra-High-Speed Transmission Line Differential Protection Using an Error Index of Bergeron Equation”. IEEE Latin America Transactions, vol. 19, no. 7, Mar. 2021, pp. 1182-90, https://latamt.ieeer9.org/index.php/transactions/article/view/4254.