Include CMAME paper citation in documentation

[kip-hart]

PR Summary

Purpose

Add citation to recently accepted article in Computer Methods in Applied Mechanics and Engineering (CMAME)

Approach

n/a

Learning

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PR Checklist

• [x] All tox commands succeed
• [x] Docs have been added / updated (for bug fixes / features)
• [x] Has pytest style unit tests

Closing Issues

n/a