Compressive strength of comet 67P/Churyumov-Gerasimenko derived from Philae surface contacts P. Heinisch, H.-U. Auster, B. Gundlach, J. Blum, C. Güttler, C. Tubiana, H. Sierks, M. Hilchenbach, J. Biele, I. Richter and K. H. Glassmeier A&A, 630 (2019) A2 Published online: 20 September 2019 DOI: 10.1051/0004-6361/201833889