Isotopic abundances of carbon and nitrogen in Jupiter-family and Oort Cloud comets D. Hutsemékers, J. Manfroid, E. Jehin, C. Arpigny, A. Cochran, R. Schulz, J. A. Stüwe and J.-M. Zucconi A&A, 440 2 (2005) L21-L24 Published online: 01 September 2005 DOI: 10.1051/0004-6361:200500160