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- [25] Experience in implementation of modern digital office automatic telephone exchange at 'Zaporozhstal'' company Metallurgicheskaya i Gornorudnaya Promyshlennost, 2003, (05): : 116 - 118
- [26] Automatic Crossbar Subscriber Telephone Exchange Type SKW 1000 in Compact construction. Hasler Mitteilungen, 1972, 31 (1-2): : 1 - 14