Tozzi, G. P., Patriarchi, P., Boehnhardt, H., Vincent, J.-B., Licandro, J., Kolokolova, L., et al. (2011). Evolution of the dust coma in comet 67P/Churyumov-Gerasimenko before the 2009 perihelion. Astronomy and Astrophysics, 531: A54. doi:10.1051/0004-6361/201116577.