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- [3] RECIPROCAL FERRITE PHASE-SHIFTER MEASUREMENTS PROCEEDINGS OF THE INSTITUTE OF RADIO ENGINEERS, 1962, 50 (12): : 2516 - &
- [5] FREQUENCY-INDEPENDENT PHASE-SHIFTER JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1979, 12 (11): : 1031 - 1033
- [6] A FREQUENCY-INDEPENDENT PHASE-SHIFTER JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1980, 13 (12): : 1346 - 1347