  Recent reports on quantum oscillations in MgB2 provide valuable information
on three important aspects of this material: (1) electronic structure near the
Fermi level, (2) disparity of the electron-phonon interaction between the two
systems of bands (3) renormalization of spin susceptibility. However,
extraction of most of this information requires highly accurate band structure
calculations of the relevant quantities. In this paper we provide such
calculations and use them to analyze the experimental data.
