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- [4] INSTANTANEOUS RATEMETER FOR LOW-FREQUENCY SIGNALS ELECTRONIC ENGINEERING, 1978, 50 (601): : 27 - 27
- [8] A TRANSISTOR INSTANTANEOUS FREQUENCY METER MEDICAL & BIOLOGICAL ENGINEERING, 1967, 5 (04): : 387 - &
- [10] RAPID LOW-FREQUENCY TRANSISTORIZED FREQUENCY METER WITH A STANDARD CURRENT OUTPUT MEASUREMENT TECHNIQUES-USSR, 1968, (08): : 1098 - &