1. Alfvén, H.: 1981,Cosmic Plasma, D. Reidel Publ. Co., Dordrecht, Holland.
2. Alfvén, H. and Arrhenius, G.: 1976,Evolution of the Solar System, NASA SP-345, NASA Scientific and Technical Information Office, Washington, D.C.
3. NATO Conf. Orig. Solar System, Newcastle, April 1976;G. Arrhenius,1976
4. Arrhenius, G., Fitzgerald, R., Markus, S., and Simpson, C.: 1978,Astrophys. Space Sci. 55, 285.
5. Arrhenius, G., McCrumb, J. L., Friedman, N., and Fitzgerald, R.: 1979a,Lunar and Planetary Sci. 10, 795.