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<ref>[http://www.sciencenews.org/pages/sn_arc98/4_11_98/fob3.htm Science News: Evading quantum barrier to time travel] {{Webarchive|url=https://web.archive.org/web/20050517075240/http://www.sciencenews.org/pages/sn_arc98/4_11_98/fob3.htm |date=17. maj 2005 }} Citat: "...Gott says. "Quantum effects do not automatically enforce chronology protection in every case."..."</ref>
<ref>[http://news.bbc.co.uk/1/hi/sci/tech/4097258.stm 17 June, 2005, BBC News: New model 'permits time travel'] Citat: "...It is as if, in some strange way, the present takes account of all the possible routes back into the past and, because your father is certainly alive, none of the routes back can possibly lead to his death..."</ref>