Low CO/CO2 ratios of comet 67P measured at the Abydos landing site by the Ptolemy mass spectrometerA. Morse, O. Mousis, S. Sheridan, G. Morgan, D. Andrews, S. Barber and I. WrightA&A, 583 (2015) A42DOI: https://doi.org/10.1051/0004-6361/201526624
