Perceptions of Scholars in the Field of Economics on Co-Authorship Associations: Evidence from an International Survey.

PLoS One · 2016 · PMC4913925 · PMID 27322645

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a marked trendno p-value reported

Increasing specialization, changes in institutional incentives for publication, along with a host of other reasons, have brought about a marked trend toward co-authored articles.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.