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Evidence for a subsurface ocean on Europa.
Carr MH, Belton MJ, Chapman CR, Davies ME, Geissler P, Greenberg R, McEwen AS, Tufts BR, Greeley R, Sullivan R, Head JW, Pappalardo RT, Klaasen KP, Johnson TV, Kaufman J, Senske D, Moore J, Neukum G, Schubert G, Burns JA, Thomas P, Veverka J. Carr MH, et al. Among authors: tufts br. Nature. 1998 Jan 22;391(6665):363-5. doi: 10.1038/34857. Nature. 1998. PMID: 9450749
Formation of cycloidal features on Europa.
Hoppa GV, Tufts BR, Greenberg R, Geissler PE. Hoppa GV, et al. Among authors: tufts br. Science. 1999 Sep 17;285(5435):1899-902. doi: 10.1126/science.285.5435.1899. Science. 1999. PMID: 10489365