1. Simplified analysis of electrical gradients above a ground grid: I. How good is the present IEEE method?;Sverak;IEEE Trans.,1984
2. The Ground Installations of High Voltage Substations and Transmission Lines;Oslon,1964
3. Erdungen in Wechselstromanlagen über 1 kV;Koch,1961
4. Les bases générales de la technique de mises à la terre dans les installations électrique;Laurent;Bull. Soc. Fr. Electr.,1951
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