CHIRAL LAGRANGIANS AND NAMBU-JONA-LASINIO LIKE MODELS

We discuss the low-energy analysis of models involving quarks and four -fermion couplings. The relation with QCD and with other models of mes ons and meson plus quarks at low energies is discussed. A short descri ption of how the heat-kernel expansion can be used to get regularizati on independent information, is given. The anomaly within this class of models and a physical prescription to obtain the correct flavour anom aly while keeping as much of the VMD aspects as possible is discussed. The major part is the discussion within this framework of the order p (4) action and of two and some three-point functions to all orders in momenta and quark masses. Some results on hadronic matrix elements are given.