Require spectral decomposition of RMHD equations or solution of
RMHD Riemann problem except HLL. Van Putten [178] has studied the characteristic structure of the RMHD equations
in (constraint free) divergence form as a first step to extend
modern HRSC methods to RMHD. Komissarov [84] has developed a multidimensional RMHD code based on a
linearized Riemann solver.