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Elmaarry, Mohamed Ramy; Groussin, O.; Thomas, Nicolas; Pajola, M.; Auger, A.-T.; Davidsson, B.; Hu, X.; Hviid, S. F.; Knollenberg, J.; Güttler, C.; Tubiana, C.; Fornasier, S.; Feller, C.; Hasselmann, P.; Vincent, J.-B.; Sierks, H.; Barbieri, C.; Lamy, P.; Rodrigo, Rafael; Koschny, D.; ... (2017). Surface changes on comet 67P/Churyumov-Gerasimenko suggest a more active past. Science, 355(6332), pp. 1392-1395. American Association for the Advancement of Science 10.1126/science.aak9384