In this contribution we first recall briefly the basic formulae related to the Dirac mean-field used in conjunction with the Bogolyubov formalism and particle-number projection. We present some results obtained for calculations of the moments of inertia for Super Deformed (SD) bands in the A\sim 150 mass-region, and compare them to the experimental ones. It is shown that this formalism is able to get rid of one of the drawbacks observed in standard Woods--Saxon or Hartree--Fock mean-field calculations, namely the systematic overestimation of the calculated moments of inertia.

PACS numbers: 21.60.--n, 21.10.Pc, 21.30.--x