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3. J. Chaplin, “The ESA Olympus satellite and distance learning in Europe”, ESA Bulletin, November 1988, pp35–38.
4. M. D. Windram and G. J. Tonge, “The D-MAC Transmission System for Satellite Broadcasting in the United Kindgom”, Electronics & Communication Engineering Journal, Feb. 1990. pp 11–16.
5. Bill Tuck “Networks for Collaborative Work”, Proceedings of UKOLUG Conference, Ripon UK, April 1990, published by Learned Information, Oxford, 1990.