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    • Shear-free anisotropic cosmological models in f (R) gravity 

      Abebe, Amare; Momeni, Davood; Myrzakulov, Ratbay (Springer, 2016)
      We study a class of shear-free, homogeneous but anisotropic cosmological models with imperfect matter sources in the context of f(R) gravity. We show that the anisotropic stresses are related to the electric part of the ...