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- [6] DEVELOPMENT OF ELECTRONIC AND QUASI-ELECTRONIC TELEPHONE SYSTEMS TELECOMMUNICATION JOURNAL, 1968, 35 (09): : 455 - &
- [8] ELECTRONIC KEY TELEPHONE SYSTEM FOR SMALL OR MEDIUM OFFICES. Reports of the Electrical Communication Laboratory, 1983, 31 (04): : 516 - 523
- [10] QUASI-ELECTRONIC TELEPHONE SWITCHING CENTRE STUTTGART COMPLETED 2 YEARS OF FIELD SERVICE NTZ-COMMUNICATIONS JOURNAL, 1967, 6 (5-6): : 197 - &