Pre-perihelion activity of comet 67P/Churyumov-Gerasimenko A. Guilbert-Lepoutre, R. Schulz, A. Rożek, S. C. Lowry, G. P. Tozzi and J. A. Stüwe A&A, 567 (2014) L2 Published online: 04 July 2014 DOI: 10.1051/0004-6361/201424186