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Normalised Gini coefficients for top-500 universities. Source: SCI, n of publications (in brackets). The requirement to keep the number of universities per countries stable in order to calculate a comparable national Gini coefficient across the years led in the case of China to using a cut-off point of 28 universities in the years 2005–2007, disregarding the earlier presence of three Chinese universities among the top-500 in 1990, five in 1995, and 16 in 2000
