Polarimetric observations of the comet Hale-Bopp S. Ganesh, U. C. Joshi, K. S. Baliyan and M. R. Deshpande Astron. Astrophys. Suppl. Ser., 129 3 (1998) 489-493 Published online: 15 May 1998 DOI: 10.1051/aas:1998201