1. Surface features and the rotation state of Halley's comet nucleus;Abergel;Ann. Geophy,1989
2. Rotation states of the nucleus of Comet Halley compatible with spacecraft images;Abergel;Icarus,1990
3. The wobbling nucleus of Halley's comet;Belton;Planet. Rep.,1987
4. No. 2.2 day periodicity in the production of CN haloes and plasma condensations in Comet Halley;Belton;Bull. Am. Astron. Soc.,1989
5. Rationalization of Comet Halley's periods;Belton;Icarus,1990