1. Anile, A.M. (1989) Relativistic Fluids and Magnetofluids. Cambridge University Press, Cambridge.
2. Balsara, D.S. (1994), J. Comput. Phys., 114, 284
3. Banyuls, F., Font, J.A., Ibanez, J.Ma, Marti, J.Ma and Miralles, J.A. (1995), submitted
4. Blandford, R.D. and Königl, A. (1979), Astrophys. J., 232, 34
5. Blandford, R.D. and Rees, M.J. (1974), Mo. Not. Royal Astron. Soc., 169, 395