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"No. 4 ESS-Evolution of a Digital Switching System."
R. Allen Bruce, Paul K. Giloth, Eugene H. Siegel Jr. (1979)
- R. Allen Bruce, Paul K. Giloth, Eugene H. Siegel Jr.:
No. 4 ESS-Evolution of a Digital Switching System. IEEE Trans. Commun. 27(7): 1001-1011 (1979)
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