A Note on Energy-Momentum Conservation in Palatini Formulation of L(R)   Gravity
  By establishing that Palatini formulation of $L(R)$ gravity is equivalent to $\omega=-3/2$ Brans-Dicke theory, we show that energy-momentum tensor is covariantly conserved in this type of modified gravity theory. 
Peng Wang, Gilberto M. Kremer, Daniele S. M. Alves, Xin-He Meng