  Extended recurrent pseudo-Riemannian manifolds were introduced by Mileva
Prvanovic'. We reconsider her work in the light of recent results and show that
the manifold is conformally flat, and it is a space of quasi-constant
curvature. We also show that an extended recurrent Lorentzian manifold, with
time-like associated covector, is a perfect fluid Robertson-Walker space-time.
We obtain the equation of state; in n = 4 and if the scalar curvature is zero,
a model for incoherent radiation is obtained.
