Use alphabetic bibliography style

[bsdjhb]

This will hopefully ease comparisons of future revisions. Currently the PDF diff between 8 and 9 is cluttered to the point of uselessness by citation renumbering.

[brooksdavis]

Looks good to me. It won't be 100% stable, but you'll only see changes in small areas like if we added another 2020 Arm citation that sorted in the middle.

[brooksdavis]

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