Relativistic NJL Model with Light and Heavy Quarks
  We study the Nambu-Jona-Lasinio model with light and heavy quarks in a relativistic approach. We emphasize relevant regularization issues as well as the transition from light to heavy quarks. The approach of the electromagnetic meson form factor to the Isgur-Wise function in the heavy quark limit is also discussed. 
A. L. Mota and E. Ruiz Arriola