Comment on "Magnetotransport through graphene spin valves" and its   following works
  We show that the key formula in the works [Ding, Zhu, and Berakdar, Phys. Rev. B {\bf 79}, 045405 (2009); {\bf 84}, 115433 (2011); Ding, Zhu, Zhang, and Berakdar, Phys. Rev. B {\bf 82}, 155143 (2010)] is invalid in the extended graphene system they investigated. The correct formalism in the extended infinite system is also presented in this comment. 
Y. Zhou and M. W. Wu
cond-mat.mes-hall cond-mat.quant-gas