Looking for free downloadable articles on primordial He

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The discussion revolves around the search for free downloadable articles on primordial helium (He) abundance calculations. Users express interest in understanding the methodologies behind the graphs depicting He abundance relative to baryon and photon numbers, commonly found in discussions of Big Bang nucleosynthesis. There is a specific request for original papers that detail the calculations rather than general explanations. The inquiry suggests that the calculations may involve rate equations similar to those in chemistry. Access to these foundational papers would greatly enhance understanding of the topic.
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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.
 

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