1. CIGRÈ Guide to procedures for estimating the lightning performance of transmission lines, WG 01 (Lightning), Study Committee 33, 1991.
2. IEEE Guide for Improving the Lightning Performance of Transmission Lines, IEEE Std. 1243–1997 (1997) 1–44. 10.1109/IEEESTD.1997.84660.
3. CIGRÈ WG C4.33, Impact of soil-parameters frequency dependence on the response of grounding electrodes and on the lightning performance of electrical systems, Cigré TB 781 01 (October) (2019) 66.
4. A universal impedance for soils;Smith,1975
5. Another soil conductivity model;Messier,1985