Jönsson, K. Ingemar; Rabbow, Elke; Schill, Ralph O.; Harms-Ringdahl, Mats; Rettberg, Petra. Tardigrades survive exposure to space in low Earth orbit. Current Biology. 2008-09-09, 18 (17): R729–R731. PMID 18786368. doi:10.1016/j.cub.2008.06.048.
Jönsson, K. Ingemar; Rabbow, Elke; Schill, Ralph O.; Harms-Ringdahl, Mats; Rettberg, Petra. Tardigrades survive exposure to space in low Earth orbit. Current Biology. 2008-09-09, 18 (17): R729–R731. PMID 18786368. doi:10.1016/j.cub.2008.06.048.