Evolution of the dust coma in comet 67P/Churyumov-Gerasimenko before the 2009 perihelion G. P. Tozzi, P. Patriarchi, H. Boehnhardt, J.-B. Vincent, J. Licandro, L. Kolokolova, R. Schulz and J. Stüwe A&A, 531 (2011) A54 Published online: 10 June 2011 DOI: 10.1051/0004-6361/201116577