  The effect of electronic band curvature, i.e. the deviation from parabolicity
of electronic dispersion, on de Haas-van Alphen oscillations spectra is
studied. Although the oscillations amplitude remain unaffected, it is
demonstrated that non-quadratic terms of the Landau bands dispersion, which is
particularly relevant in the case of Dirac fermions, induces a field- and
temperature-dependent Onsager phase. As a result, a temperature-dependent shift
of the de Haas-van Alphen oscillations frequency is predicted.
