1. Alfvén, H.: 1954, ?The Origin of the Solar System?, Oxford Univ. Press, London.
2. Basano, L. and Hughes, D. W.: 1979,II Nuevo Cimento, Vol. 2C, No. 5, p. 505.
3. Berlage, H. P. Jr.: 1948,Proc. Kronikl. Ned. Akad. Wetenschap, (Amsterdam),51, 965 and51, 796.
4. Birkeland, K.: 1912,Compt. Rend. Acad. Sci. Paris 155, 892.
5. Bohr, N.: 1913,Philosophical Magazine 26, 1.