Constraints on the subsurface structure and density of the nucleus of Comet 67P/Churyumov-Gerasimenko from Arecibo radar observationsP. Kamoun, P. L. Lamy, I. Toth and A. HeriqueA&A, 568 (2014) A21DOI: https://doi.org/10.1051/0004-6361/201423544
