1. Sagdeev, R. Z., Balebanov, V. M. & Zakharov, A. V. Soviet Sci. Rev. E. Astrophys. Space Phys. 6, 1–60 (1988).
2. Kremnev, R. S., Rogovskyi, G. N. & Sukhanov, K. G. Sci. USSR 1(43), 2–8 (1988).
3. Avanesov, G. A. et al. Nature 341, 585–587 (1989).
4. Ksanfomalit, L. V. et al. Nature 341, 588–591 (1989).
5. Bibring, J.-P. et al. Nature 341, 591–593 (1989).