't Hooft's quantum determinism -- path integral viewpoint
  We present a path integral formulation of 't Hooft's derivation of quantum from classical physics. Our approach is based on two concepts: Faddeev-Jackiw's treatment of constrained systems and Gozzi's path integral formulation of classical mechanics. This treatment is compared with our earlier one [quant-ph/0409021] based on Dirac-Bergmann's method. 
Massimo Blasone, Petr Jizba, Hagen Kleinert