  Even though organic conductors have complicated crystalline structure with
low symmetry and large unit cell, band structure calculations predict multiband
quasi-two dimensional electronic structure yielding very simple Fermi surface
in most cases. Although few puzzling experimental results are observed, data of
numerous compounds are in agreement with calculations which make them suitable
systems for studying magnetic quantum oscillations in networks of orbits
connected by magnetic breakdown. The state of the art of this problematics is
reviewed.
