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WikiPedia: Harold_Urey http://cantic.bnc.cat/registres/CUCId/a11179600 http://www.youtube.com/watch?v=hmsJpJLRGc4 http://www.nap.edu/readingroom/books/biomems/hurey... http://alsos.wlu.edu/qsearch.aspx?browse=people/Ur... http://www.osti.gov/accomplishments/urey.html http://uli.nli.org.il/F/?func=direct&doc_number=00... http://data.bibliotheken.nl/id/thes/p108192393 //dx.doi.org/10.1007%2FBF01795747 //dx.doi.org/10.1098%2Frsbm.1983.0022 https://nla.gov.au/anbd.aut-an35573939