декабря 2016. Дата обращения: 26 декабря 2016. Globally, crude's reserves-to-productionratio has hovered between 40-55 years. {{cite news}}: |archive-date=
ratios in the range of 9 to 42 RA; where RA is the present day atmospheric 3He/4He ratio of 1,39⋅10−6 [8, 18].» The 3He/4He ratio of the new internal He
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