Update citations

[chongchonghe]

Description

Update citation for the newly published multigroup RHD paper on arxiv.

Checklist

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• I have added a description (see above).
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• I have added tests for any new physics that this PR adds to the code.
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[BenWibking]

I think it's a bit repetitive to have the citation repeated three times:

Maybe you could create a separate bibliography block for each bullet point?

[chongchonghe]

I think it's a bit repetitive to have the citation repeated three times:

Maybe you could create a separate bibliography block for each bullet point?

I tried, but you'll get two bibliographies with the same citation key, since they have the same authors and year. I don't know a way to get away with it, so that's the best way I found that is concise and also displays the full article titles in the same page.

If two times instead of three times is better, I can replace cite:ts: with cite:, which would remove the first occurrence of the names.

[BenWibking]

Ok, I think this is better.