How Particles can Emerge in a Relativistic Version of Bohmian Quantum   Field Theory: Part 2 - Fermions
  It is shown how Fermionic material particles can emerge from a covariant formulation of the de Broglie-Bohm theory. Material particles are continuous fields, formed as the eigenvalue of the Schrodinger field operator, evaluated along a Bohmian trajectory. The motivation for this work is due to a theorem proved by Malament that states there cannot be a relativistic quantum mechanics of localizable particles. 
T. Mark Harder
quant-ph hep-th