A fluorescence model of the C3 radical in comets P. Rousselot, C. Arpigny, H. Rauer, A. L. Cochran, R. Gredel, W. D. Cochran, J. Manfroid and A. Fitzsimmons A&A, 368 2 (2001) 689-699 Published online: 15 March 2001 DOI: 10.1051/0004-6361:20000578