1. The generation of artifical aurorae;Hess;NASA Contractor Rept. NASA-CR-94330,1968
2. On the stability of an electron beam injected along the geomagnetic field;Alekhin,1971
3. This suggestion has been forwarded by D. D. Rjutov.
4. Diagnostics of a turbulent plasma by means of an external ion beam;Koydan,1973
5. Space physics with artificial satellites;Al'pert,1965