There is a substantial article on this topic in the  The Encyclopedia of Ghosts by Daniel Cohen It runs to around five pages of text which I could I guess email to anyone who sent me an email There is also a substantial article in the Guiley Encyclopedia of Ghosts and Spirits which I might be able to get by the weekend Or if anyone were interested it might be possible to get those articles and maybe more from WPRX Anyway if anyone wants at least the first article drop me an email Alternately if anyone wants me to contact RX or chooses to contact them themselves it would probably be a good idea to let others know the documents are available