On the relativistic BGK-Boltzmann model: asymptotics and hydrodynamics
  The generalization of the BGK relaxation model to the special relativity setting is revisited here. We deal with several issues related to this relativistic kinetic model which seem to have been overlooked in the previous physical literature, including the unique determination of associated physical parameters, classical, ultra-relativistic and hydrodynamical limits, maximum entropy principles and the analysis of the linearized operator. 
Abdel Bellouquid, Juan Calvo, Juanjo Nieto, Juan Soler
math-ph math.MP