Field sources in a Lorentz symmetry breaking scenario with a single   background vector
  This paper is devoted to investigating the interactions between stationary sources of the electromagnetic field, in a model which exhibits explicit Lorentz-symmetry breaking due to the presence of a single background vector. We focus on physical phenomena that emerge from this kind of breaking and which have no counterpart in Maxwell Electrodynamics. 
L.H.C. Borges, F.A. Barone, J.A. Helayel-Neto
hep-th