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British Telecommunications (1992). Connect Direct, private circuits.BT,London.
Kennedy, G. (1977). Electronic Communications Systems. McGraw-Hill
Kogashuka, Tokyo.
Terman, F.E. (1943), Radio Engineers’ Handbook, McGraw-Hill, London. Winder, S.W. (2001). Newnes Telecommunications Pocket Book. ButterworthHeinemann, Oxford.