  We discuss the difficulties to discover Kondo effect in the resistivity of
graphene. Similarly to the Kondo effect, electron-electron interaction effects
and weak localization appear as logarithmic corrections to the resistance. In
order to disentangle these contributions, a refined analysis of the
magnetoconductance and the magnetoresistance is introduced. We present
numerical simulations which display the discrimination of both effects.
Further, we present experimental data of magnetotransport. When magnetic
molecules are added to graphene, a logarithmic correction to the conductance
occurs, which apparently suggests Kondo physics. Our thorough evaluation
scheme, however, reveals that this interpretation is not conclusive: the data
can equally be explained by electron-electron interaction corrections in an
inhomogeneous sample. Our evaluation scheme paves the way for a more refined
search for the Kondo effect in graphene.
