1. Alfvén, H. (1960): On the Origin of the Solar System (Oxford University Press, New York). See also Rev. Mod. Phys. 32 710
2. Alfvén, H., Fälthammer, C.-G. (1963): Cosmic Electrodynamics (Oxford University Press, New York)
3. Alfvén, H. (1981): Cosmic Plasma (D. Reidei Publ. Co., Dordrecht, Holland) Chap. IV
4. Fälthammar, C.-G. (1977): “Problems related to macroscopic electric fields in the magneto-sphere,” Rev. Geophys. Space Phys. 15 457
5. Helliwell, R. A. (1967): Whistlers and Related Ionspheric Phenomena (Stanford Univ. Press, Stanford)