The extraordinary composition of the blue comet C/2016 R2 (PanSTARRS) N. Biver, D. Bockelée-Morvan, G. Paubert, R. Moreno, J. Crovisier, J. Boissier, E. Bertrand, H. Boussier, F. Kugel, A. McKay et al. (2 more) A&A, 619 (2018) A127 Published online: 14 November 2018 DOI: 10.1051/0004-6361/201833449