More on  deceased Keen- backup from  Dr Gary Schwartz

  A good summary of the commendably  rigorous  procedures of Dr Gary Schartz,  Arizona University, to ensure that the  communications from deceased Montague  Keen are in fact genuine.

Rigorous identification of Montague Keen
Poltergiests Ghosts seriously reviewed  by Skeptics
Nazi Germany built on  Satanic Worship Occultism
  Halleluiah ! It seems we have a rarity. An honest "skeptic" ! Dr Barrie Colvin
  History Channel Documentary summarised may surprise you