Parallelization Strategies for ALI Radiative Transfer in Moving Media
  We describe the method we have used to parallelize our spherically symmetric special relativistic short characteristics general radiative transfer code PHOENIX. We describe some possible parallelization strategies and show why they would be inefficient. We discuss the multiple parallelization strategy techniques that we have adopted. We briefly discuss generalizing these strategies to full 3-D (spatial) radiation transfer codes. 
E. Baron, P. H. Hauschildt, and D. Lowenthal