On the Relations between Gravity and BF Theories
  We review, in the light of recent developments, the existing relations between gravity and topological BF theories at the classical level. We include the Plebanski action in both self-dual and non-chiral formulations, their generalizations, and the MacDowell-Mansouri action. 
Laurent Freidel and Simone Speziale
gr-qc hep-th