Frequency conversion using the quasiparticle nonlinearity of Nb--Al/sub 2/O/sub 3/--Nb tunnel junctions
Alexander N. Vystavkin, V. P. Koshelets, G. A. Ovsyannikov, I. L. Serpuchenko, S. V. Shitov
Alexander N. Vystavkin, V. P. Koshelets, G. A. Ovsyannikov, I. L. Serpuchenko, S. V. Shitov