  We consider here special closed electron trajectories that arise during
reconstructions of electron dynamics on the Fermi surface in the presence of
strong magnetic fields, as well as the phenomenon of intraband magnetic
breakdown that occurs on such trajectories. We consider cases where the
electronic spectrum arising in such a situation corresponds to the resonant
contribution to quantum oscillations. In the paper, all cases where this occurs
are singled out, and the possible influence of the appearance of the Berry
phase and other effects on the described phenomena is also considered.
