Separability of Hamilton-Jacobi and Klein-Gordon Equations in General   Kerr-NUT-AdS Spacetimes
  We demonstrate the separability of the Hamilton-Jacobi and scalar field equations in general higher dimensional Kerr-NUT-AdS spacetimes. No restriction on the parameters characterizing these metrics is imposed. 
Valeri P. Frolov, Pavel Krtous, David Kubiznak