Citation abbr (4)

I think it could be either:

ibid

etal

(Other definitions for ibid that I've seen before include "'In the same place as previously mentioned, in short (4)'" , "In brief, notation meaning in came book or passage" , "(When citing a reference) in the same place (abbr)" , "(When citing a reference) in the same place (Latin)" , "(With written references) in the same place (Latin)" .)

I've seen this clue in the Universal, the Ink Well xwords, The New York Times, The Washington Post, The Wall Street Journal, The Washington Post Sunday, the LA Times, The Chronicle of Higher Education and the USA Today.

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