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...isotopes, [[protium]] {{sup|1}}H and [[deuterium]] {{sup|2}}H, which vary in relative abundance on the order of hundreds of [[Per mille|permil]]. The ra ...belprize.org/nobel_prizes/chemistry/laureates/1934/ |title=The Nobel Prize in Chemistry 1934 |website=www.nobelprize.org|access-date=2016-05-13}}</ref> ...