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Jönsson, K. Ingemar; Rabbow, Elke; Schill, Ralph O.; Harms-Ringdahl, Mats; Rettberg, Petra (9 September 2008). ”Tardigrades survive exposure to space in low Earth orbit”. Current Biology 18 (17): sid. R729–R731. doi:10.1016/j.cub.2008.06.048. PMID 18786368.