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- [2] DEVELOPMENTS IN FREQUENCY-SHIFT VOICE-FREQUENCY TELEGRAPH EQUIPMENT POST OFFICE ELECTRICAL ENGINEERS JOURNAL, 1979, 72 (OCT): : 191 - 196
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- [5] A WIDEBAND MULTI-CHANNEL VOICE-FREQUENCY TELEGRAPH SYSTEM POST OFFICE ELECTRICAL ENGINEERS JOURNAL, 1967, 60 : 10 - &
- [7] TELEGRAPH DISTORTIONS AND ERROR RATE IN FREQUENCY MODULATED VOICE-FREQUENCY TELEGRAPH SYSTEMS OWING TO SUDDEN PHASE CHANGES ON TRANSMISSION PATH NACHRICHTENTECHNISCHE ZEITSCHRIFT, 1970, 23 (08): : 412 - &