[Election-Methods] Methods to prevent ghost voting?

[mrouse1 at mrouse.com]

Several people have worked on preventing selling, removing, or altering
votes (Ronald Rivest, Warren Smith, and others). I probably have
overlooked it, but has there been any work done on preventing people from
*adding* fraudulent votes -- the infamous "Chicago voting" problem, where
cemeteries rise en mass to vote for their favored candidate? It's an
interesting problem, since it seems applicable to preventing ticket fraud
and counterfeiting as well as vote fraud.