1. Predicted conversion gain in SIS quasiparticle mixers;Tucker;Appl. Phys. Lett.,1980
2. Smith, A.D., McGrath, W.R., Richards, P. L., van Kempen, H., Prober, D. and Santhanam, P., (to be published).
3. See also Kerr, A.R., S-Pan, Feldman, M.J. and Davidson, A. (in this issue).