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I thought that the only reason to cite the arXiv is to allow those of us without paid subscriptions to read the paper :D . The abstract page will tell you immediately if it's been published (by including a "Journal Reference" at the bottom of the page), so all you need to do is to visit the abstract page. Shouldn't you have to do this even if it's a peer-reviewed journal? Wouldn't this apply to any discipline? (I happen to be in that particular category that Zap mentioned who cites the arXiv ubiquitously; I didn't know that it was an atypical practice.)
