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http://www.huffingtonpost.fr/2013/08/...lits_n_3694515.html?utm_hp_ref=france
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http://www.techniques-ingenieur.fr/ac...on-une-etude-americaine-article_80393
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http://www.theverge.com/2013/3/8/4078...-most-of-last-11300-years-study-finds
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