no preprint
P. Hyldgaard, S. Hershfield, John H. Davies, and J. W. Wilkins,
Resonant-tunneling with an electron-phonon interaction,
Annals of Physics 236, 1 (1994).
The manuscript is now
available (scanned pdf) at science direct.
Alternatively, here are, in gzipped postscript format, preprint
versions of: