Gefen et al. respond [1]

C.P. Umbach, S. Washburn, et al.

International Conference on Low Temperature Physics (LT) 1983

V. Foglietti, R.H. Koch, et al.

Journal of Applied Physics

E.J. Pakulis, R.L. Sandstrom, et al.

Applied Physics Letters

R.B. Laibowitz, J.Z. Sun, et al.

IEEE TAS