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 LA Times, the USA Today, The Washington Post Sunday, the Universal, the New York Times, the Wall Street Journal, The Washington Post, The Chronicle of Higher Education and the Ink Well xwords.

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