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== Referències ==
{{referències|2|refs=
<ref name="hawkinghuffi">{{Citar ref-web |títol=PublicStephen Hawking Quotes In Spotlight As Famous Physicist Celebrates 71st Birthday Lectures(PHOTOS) |url=http://www.hawkinghuffingtonpost.org.ukcom/lectures2013/01/08/stephen-hawking-quotes-birthday_n_2427562.html |obra=StephenThe HawkingHuffington Official WebsitePost |lloc=Cambridge |editor=Head ofTheHuffingtonPost.com, MediaInc Relations|data=8 atde Cambridgegener Universityde |data=2013 |consulta=21 gener 2013}}</ref>
<ref name="huffihawking">{{Citar ref-web |títol=Stephen Hawking Quotes In Spotlight As Famous Physicist Celebrates 71st BirthdayPublic (PHOTOS)Lectures |url=http://www.huffingtonposthawking.comorg.uk/2013/01/08/stephen-hawking-quotes-birthday_n_2427562lectures.html |obra=TheStephen HuffingtonHawking PostOfficial Website |lloc=Cambridge |editor=Head TheHuffingtonPost.com,of IncMedia |data=8Relations deat generCambridge deUniversity 2013|data= |consulta=21 gener 2013}}</ref>
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