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- [6] CONVERTING AN AM RADIO INTO A HIGH-FREQUENCY LOCK-IN AMPLIFIER IN A STIMULATED RAMAN EXPERIMENT REVIEW OF SCIENTIFIC INSTRUMENTS, 1986, 57 (03): : 390 - 392
- [7] Lock-in frequency measurement with high precision and efficiency REVIEW OF SCIENTIFIC INSTRUMENTS, 2020, 91 (07):
- [8] A pentode lock-in amplifier of high frequency selectivity REVIEW OF SCIENTIFIC INSTRUMENTS, 1941, 12 (09): : 444 - 447