P Degauque and J Hamelin (Editors) 'Electromagnetic Compatibility', OU Press, 1993.

ITU Report 670-1, 'World-wide minimum external noise levels,0.1Hz to 100GHz', (1979-1990), Dusseldorf, Annex to Vol I, 1990

ITU Report 258-5, 'Man -made radio noise', (1963-1990), Dusseldorf, Annext to vol VI, 1990.