Herschel HIFI observations of the Sgr A +50 km s-1 Cloud - Deep searches for O2 in emission and foreground absorptionAa. Sandqvist, B. Larsson, Å. Hjalmarson, P. Encrenaz, M. Gerin, P. F. Goldsmith, D. C. Lis, R. Liseau, L. Pagani, E. Roueff and S. VitiA&A, 584 (2015) A118DOI: https://doi.org/10.1051/0004-6361/201526280
