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

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