1. The composition and dynamics of cometary ions in the outer coma of comet P/Halley;Balsiger;Astron. Astrophys.,1987
2. Is CO2 responsible for the outburst of comet Halley?;Feldman;Nature,1986
3. Encounter with comets: discoveries and puzzles in cometary plasma physics;Galeev;Astron. Astrophys.,1987