1. Cosmic Plasma
2. The Voyager I/Saturn encounter and the cosmogonie shadow effect;Alfve'n;Astrophys. & Spa. Sci.,1981
3. Haerendel , G. Proceedings of the Workshop on "Alfve'n's Critical Velocity Effect October 11-13, MPE, ISSN 0340-8922 Max Planck Institut für extraterrestrische Physik Garching, West Germany 1982