Quantum-Mechanical Description of the Electromagnetic Interaction of   Relativistic Particles with Electric and Magnetic Dipole Moments
  The Hamiltonian of relativistic particles with electric and magnetic dipole moments that interact with an electromagnetic field is determined in the Foldy-Wouthuysen representation. Transition to the semiclassical approximation is carried out. The quantum-mechanical and semiclassical equations of spin motion are derived. 
A. J. Silenko