1. A’Hearn, M. L., Hoban, S., Birch, P.V., Bowers, C., Martin, R., Klinglesmith III, D.A.: 1986, Proc. 20th ESLAB Symposium on the Exploration of Halley’s Comet, eds. B. Battrick, E.J. Rolfe, R. Reinhard, ESA SP-250, Vol. I, p. 483
2. Alfvén, H.: 1957, Tellus
9, 92
3. Arrhenius, S.A.: 1900. Phys. Z. 2, 81
4. Axford, W.I.: 1964, Planet. Space Sci. 12, 719
5. Balsiger, H., Altwegg, K., Bühler, F., Geiss, J., Ghielmetti, A.G., Goldstein, B. E., Goldstein, R., Huntress, W.T., Ip, W.-H., Lazarus, A.J., Meier, A., Neugebauer, M., Rettenmund, U., Rosenbauer, H., Schwenn, R., Sharp, R. D., Shelley, E.G., Ungstrup, E., Young, D. T.: 1986, Nature
321, 330