Quasihomogeneous three-dimensional real analytic Lorentz metrics
  We classify germs at the origin of real analytic Lorentz metrics on R^3 which are quasihomogeneous, in the sense that they are locally homogeneous on an open set containing the origin in its closure, but not locally homogeneous in the neighborhood of the origin. 
Sorin Dumitrescu (JAD)
math.DG