Equations of motion for charged particles in strong laser fields
  Starting from the Dirac equation coupled to a classical radiation field a set of equations of motion for charged quasi-particles in the classical limit for slowly varying radiation and matter fields is derived. The radiation reaction term derived in the paper is the Abraham-Lorentz-Dirac term. 
Hartmut Ruhl and Christian Herzing
physics.class-ph gr-qc hep-th