  Hyperfine interactions, magnetic interactions between the spins of electrons
and nuclei, in graphene and related carbon nanostructures are studied. By using
a combination of accurate first principles calculations on graphene fragments
and statistical analysis, I show that both isotropic and dipolar hyperfine
interactions can be accurately described in terms of the local electron spin
distribution and atomic structure. A complete set of parameters describing the
hyperfine interactions of C-13 and other nuclear spins at substitution
impurities and edge terminations is determined.
