Adverbs

(r)et al., et al, et alii, et aliae, et aliaand others (`et al.' is used as an abbreviation of `et alii' (masculine plural) or `et aliae' (feminine plural) or `et alia' (neuter plural) when referring to a number of people)“the data reported by Smith et al.”
(r)et al., et al, et alibiand elsewhere (used when referring to other occurrences in a text)