HELP-PVX purification?

[maxwell at calshp.cals.wisc.edu]

Hi.  I'm not a virologist, but I am in need of a good protocol for 
purifying Potato Virus X.  As in good, I mean technically easy, and
high yielding.  If you can point me to a paper that describes the 
technique well, or describe it to me, I would be very appreciative.
Please email since I do not read this group frequently.

Thanks in advance.
--
David Maxwell
382 Russell Labs                          maxwell at calshp.cals.wisc.edu
1630 Linden Drive                         dlm at plantpath.wisc.edu