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- [7] MICROWAVE TRANSISTOR PARAMETRIC-AMPLIFIER IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII RADIOELEKTRONIKA, 1981, 24 (11): : 73 - 74
- [9] A LOW-NOISE MICROWAVE QUADRUPOLE AMPLIFIER PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1961, 49 (06): : 1016 - &
- [10] THE QUADRUPOLE AMPLIFIER, A LOW-NOISE PARAMETRIC DEVICE PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1959, 47 (10): : 1713 - 1723