Stochastic vacuum model and dual theory: a comparison in the context of   the heavy quarkonia potential
  The $Q \bar{Q}$ semirelativistic interaction in QCD can be expressed in terms of the Wilson loop and its functional derivatives. In this framework we discuss the complete (velocity and spin dependent) $1/m^2$ potential in the stochastic vacuum model and in the dual theory. 
N. Brambilla (Milano) and A. Vairo (Bologna)