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- [2] HIGH-SPEED MICROELECTRON DIGITAL FREQUENCY METER FOR LOW-FREQUENCIES PRIBORY I TEKHNIKA EKSPERIMENTA, 1973, (03): : 268 - 268
- [4] MEASURING LOW-FREQUENCIES USING A FREQUENCY-MULTIPLIER ELECTRONICS WORLD & WIRELESS WORLD, 1995, (1715): : 868 - 868
- [6] AUTOMATIC DIGITAL FREQUENCY METER FOR LOW FREQUENCIES MEASUREMENT TECHNIQUES-USSR, 1966, (09): : 1192 - &
- [9] SELECT INDUCTANCE-MEASURING BRIDGE FOR LOW-FREQUENCIES AND AUDIO-FREQUENCIES ARCHIV FUR TECHNISCHES MESSEN UND MESSTECHNISCHE PRAXIS, 1969, (401): : 139 - &