Looking for free downloadable articles on primordial He

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houlahound
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I have seen the graphs of He abundance as a function of baryon number divided by photon number. these graphs are easy to find on any site discussing the BB and BB nucleosynthesis, they are very common and aimed at the general reader.I find it a fascinating graph, I would really like to see how the calculation was done to generate the numbers on the graph.

I have searched on google but only find explanations and not raw calculations, I am assuming they are rate equations not unlike those found in chemistry?
 
The titles of the original papers that calculated the abundances of the primordial elements would be good if anyone could post them.