1. Wave propagation in overhead wires with ground return;Carson;Bell System Technical Journal,1926
2. Propagation of HF currents in ground return circuits;Wise;Proceedings of Institute of Electrical Engineers London, U.K.,1934
3. Earth Conduction Effects in Transmission Systems;Sunde,1949
4. Theory of wave propagation along a thin wire parallel to an interface;Wait;Radio Science,1972
5. Transient analysis of underground power transmission system;Wedepohl;Proceedings of IEE,1973