“…Nevertheless, using citations as a proxy for quality is not without problems (for recent discussions, see Coupé, Ginsburgh, andNoury, 2010, andPiatti, 2011). For example, fields with a larger research population attract more citations (Arrow et al, 2011;Cole and Cole, 1971), and citations can be driven by fashion (van Dalen and Klamer, 2005).…”