Compact cryogenic wide-band balanced amplifiers with superconducting 90° hybrids for the IF of submillimeter-wave SIS mixers

1. Amils, R.I.
2. López-Fernández, I.
3. Gallego, J.D.
4. Desmaris, V.
5. Belitsky, V.
6. Meledin, D.
7. Sundin, E.
8. Diez, C.
9. Malo, I.