1. Alexander, A. F. O’d.: 1953, J. Brit. Astron. Assoc.
64, 26.
2. Alexander, A. F. O’d.: 1962, The Planet Saturn: A History of Observation, Theory and Discovery, Macmillan, New York, 474 pp.
3. Alfvén, H.: 1942–45, Stockholm Obs. Ann.
14, 5 and 9.
4. Alfvén, H.: 1943, Arkiv Math. Astron. Fysik
29A.
5. Alfvén, H.: 1961, Astrophys. J.
133, 1049–1054.