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- [6] ALARM SIGNALING IN THE EWSD DIGITAL SWITCHING SYSTEM. Telcom Report (English Edition), 1987, 10 (04): : 168 - 175
- [7] DIGITAL CONCENTRATORS IN THE EWSD TELEPHONE SWITCHING SYSTEM. Telcom Report (English Edition), 1982, 5 (04): : 262 - 266
- [8] PROGRAMMED AIDS IN THE EWSD TELEPHONE SWITCHING SYSTEM. Telcom Report (English Edition), 1981, 4 (02): : 89 - 94
- [9] TRUNK LINE OF THE IKM-15 DIGITAL TRANSMISSION SYSTEM. Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika), 1981, 35-36 (04): : 1 - 8