Ugh. The FOCS CFP suggests using citations as nouns: Authors are asked to avoid "et al." in citations in favor of an equal mention of all authors' surnames. If the number of authors is large, consider writing "\cite{XYZ} show..." instead of "X et al. show".
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@fortnow I second this and usually tell my students to not do this as it reads super odd unless you have a photographic memory of the bibliography and implicitly replace these objects.