All electro--vacuum Majumdar--Papapetrou space--times with nonsingular   black holes
  We show that all Majumdar--Papapetrou electrovacuum space--times with a non--empty black hole region and with a non--singular domain of outer communications are the standard Majumdar--Papapetrou space--times. 
Piotr T. Chrusciel, Nikolai S. Nadirashvili