The atmosphere of comet 67P/Churyumov-Gerasimenko diagnosed by charge-exchanged solar wind alpha particlesC. Simon Wedlund, E. Kallio, M. Alho, H. Nilsson, G. Stenberg Wieser, H. Gunell, E. Behar, J. Pusa and G. GronoffA&A, 587 (2016) A154DOI: https://doi.org/10.1051/0004-6361/201527532