Magnetoresistance in Graphite: Do Dirac Fermions play a role?

We calculate the dependence of basal transverse magnetoresistance in graphite (H parallel to the c axis) on magnetic field and find a regime where this dependence is linear in field. The linearity is attributed to the presence of extremely light carriers near the H points of the Brillouin zone. We also explore theoretically quantum oscillations in conductivity and examine if the presence of Dirac fermions near the H points can have any signature in these oscillations.