Greene, L.H., J.B. Barner, W.L. Feldmann, L.A. Farrow, P.F. Miceli, Ramamoorthy Ramesh, B.J. Wilkens, B.G. Bagley, J.M. Tarascon, J.H. Wernick, M. Giroud, and J.M. Rowell.
"Studies of proximity-effect and tunneling in YBCO/metal layered films." Physica C: Superconductivity and its applications 162-164 (1989) 1069-1070.