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- [6] DEUTSCHE TELEKOM TO INSTALL ONE MILLION FIBER OPTIC SUBSCRIBER LINES ELECTRONICS-US, 1993, 66 (13): : 7 - 7
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- [10] ECONOMICAL METHOD OF CONSTRUCTING SUBSCRIBER OPTICAL FIBER CABLE NETWORKS. Denki Tsushin Kenkyujo kenkyu jitsuyoka hokoku, 1985, 34 (07): : 1099 - 1109