1. Telford, W.M., Geldart, L.P., Sheriff, R.E., and Keys, D.A.: ‘Applied geophysics’, (Cambridge University Press Cambridge UK 1976)
2. ‘Experimental study of induced noise voltages in telecommunications line along the 3 kV electrified single-track Skawina–Chabowka railway line’, Question A122, Technical document, DT73, International Union of Railways Office for Research and Experiments Utrecht, 1980
3. Sunde, E.D.: ‘Earth conduction effects in transmission systems’, (Dover New York 1968)