1. Anile, A. M. (1982). Le Matematiche 37, 105.
2. Anile, A. M. (1989). Relativistic fluids and magneto-fluids, (Cambridge University Press, Cambridge).
3. Barrabes, C., Israel, W. (1991). Phys. Rev. D43, 1129.
4. Beiglböck, W. (1967). Commun. Math. Phys. 5, 106.
5. Cattaneo, C. (1978). Ist. Lombardo Accad. Sci. Lett. Rend. A112, 139.