1. D.E. Daney, H.J. Boenig, M.P. Maley, J.Y. Coulter, S. Fleshier, in Advances in Cryogenic Engineering (Materials), Vol. 44, Plenum Press, New York (1998), p. 791.
2. S. Fleshier, et al, Appl Phys. Lett. 67, 3189 (1995).
3. D.E. Daney, H.J. Boenig, and M.P. Maley and S. Fleshier, Cryogenics 39, 225 (1999).
4. D.E. Daney, J.O. Willis, M.P. Maley, H.J. Boenig, R. Meie, G. Coletta, in Advances in Cryogenic Engineering (Materials), Vol. 46, Plenum Press, New York (in press).
5. J.O. Willis, D.E. Daney, M.P. Maley, H.J. Boenig, R. Meie, G. Coletta, in Advances in Cryogenic Engineering (Materials), Vol. 46, Plenum Press, New York (in press).