Low upper limits on the O2 abundance from the Odin satellite L. Pagani, A. O. H. Olofsson, P. Bergman, P. Bernath, J. H. Black, R. S. Booth, V. Buat, J. Crovisier, C. L. Curry, P. J. Encrenaz et al. (30 more) A&A, 402 3 (2003) L77-L81 Published online: 23 April 2003 DOI: 10.1051/0004-6361:20030344