  The quantum magnetic oscillations are studied for planar condensed matter
systems with a linear, Dirac-like spectrum of quasiparticle excitations. We
derive analytical expressions for magnetic oscillations (de Haas - van Alphen
effect) in the density of states, thermodynamic potential, magnetization and
chemical potential both for zero and finite temperatures, and in the presence
of scattering from impurities. We discuss also a possibility of using magnetic
oscillations for detection of a gap that may open in the spectrum of
quasiparticle excitations due to a nontrivial interaction between them.
