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- [2] A new frequency transformer or frequency changer PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1927, 15 (08): : 669 - 678
- [4] AMPLITUDE-MODULATED FREQUENCY CHANGER PROCEEDINGS OF THE INSTITUTION OF ELECTRICAL ENGINEERS-LONDON, 1972, 119 (08): : 1155 - &
- [6] CURVE RESPONSE FREQUENCY CHANGER CIRCUITS ANNALES DES TELECOMMUNICATIONS, 1968, 23 (9-10): : 235 - &
- [9] INVESTIGATION OF A RESONANCE PARAMETRIC-FREQUENCY CHANGER ELECTRICAL TECHNOLOGY, 1981, (01): : 63 - 69