Photopolarimetric Observations of Comet Halley Sen, A. K. ; Joshi, U. C. ; Deshpande, M. R. ; Kulshrestha, A. K. ; Sivaraman, K. R. Abstract Publication: Bulletin of the Astronomical Society of India Pub Date: March 1987 Bibcode: 1987BASI...15Q..23S