1. The orientation of the nucleus of Comet Halley during the Vega 1 encounter;Abergel,1990
2. Surface features and the rotation state of Halley's comet nucleus;Abergel;Ann. Geophys.,1989
3. Rationalization of Halley's periods: Evidence for an inhomegeous nucleus?;Belton;Icarus,1990
4. Restoration of Vega-1 pictures of Comet Halley's nucleus: A new method revealing clear contours and jets;Dimarellis;Astron. Astrophys.,1989
5. Periodicities in the light curve of P/Halley and the rotation of its nucleus;Festou;Astron. Astrophys.,1987