1)A 4-bit Josephson Computer ETL-JC1,
H.Nakagawa,I.Kurosawa,M.Aoyagi,S.Kosaka,Y.Hamazaki,T.Okada,S.Takada,
IEEE Transactions on Applied Superconductivity,
Vol.1,No.1,pp.37-47, March 1991.

2) X-ray detection by STJs above 1.4K,
R.Cristiano,E.Esposito,L.Frunzio,S.Pagano,A.Barone,G.Peluso,G.Pepe,H.Akoh,
H.Nakagawa,
S.Takada,
Journal of low Temperature Physics,
Vol.93, pp.691-696, 1993.

3)Normal-distribution-function-shaped Josephson tunnel junctions,
K.Kikuchi,H.Myoren,S.Takada,
Applied Physics Letters, Vol.77.No.22,pp.3660-3661, 2000.