papers on Weyl-Heisenberg systems at ftp.cs.wisc.edu/Approx

These files can be obtained by anonymous

from ftp.cs.wisc.edu/Approx. The files are postscript, and are also available as compress(ed) files, as indicated by the subscript .Z, to be uncompress(ed) before using, as well as as (shorter) gzip(ed) files, as indicated by the subscript .gz, to be extracted by gzip -d .
The files are now also available in pdf. For those from before '98, these pdf files might not look very good in an acrobat reader, but will print just fine.
If you have trouble because of file contamination, specify binary as your first command in ftp.
The files are in order of increasing age.

apframes: ps ps.Z ps.gz pdf
Time frequency representations of almost-periodic functions;
Yeon Hyang Kim and Amos Ron
decenber 2006
\CA; xx; 2008; xxx--xxx;

wh: ps ps.Z ps.gz pdf
Weyl-Heisenberg frames and Riesz bases in $L_2(\Rd)$
Amos Ron and Zuowei Shen
October 1994
Duke Math. J. {\bf 89} (1997), 237-282.