Uribe, F. A., J. Calvillo, J. Morales, and R. Bernardino. “Investigation of Conductor Sub-Division/FEM Methods for Estimating Ground-Impedances”. IEEE Latin America Transactions, vol. 18, no. 6, May 2020, pp. 1057-65, https://latamt.ieeer9.org/index.php/transactions/article/view/1348.