1. Sputter deposition of YBa2Cu3O7−ythin films
2. Advances in Cryogenic Engineering-Materials;Talvacchio,1986
3. N.G. Stoffel, W.A. Bonner, P.A. Morris, and B.J. Wilkens, 1988 MRS Fall Meeting, Symposium S (in print) also observed segregation of Ba to the surface of implanted, amorphous single crystal surfaces.