Nonholonomic Ricci Flows and Running Cosmological Constant: 3D Taub-NUT   Metrics
  The common assertion that the Ricci flows of Einstein spaces with cosmological constant can be modelled by certain classes of nonholonomic frame, metric and linear connection deformations resulting in nonhomogeneous Einstein spaces is examined in the light of the role played by topological three dimensional (3D) Taub-NUT-AdS/dS spacetimes. 
Sergiu I. Vacaru, Mihai Visinescu