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there was few references in the 1990, while lots of references were in the 2009. In Fig. 3 , the color of the line corresponded to the year of co-citation was as follows: cyan to 1991–1992, light green to 1993–1994, green to 1995–1996, lime to 1997

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? . Scientometrics 68 1 179 – 189 10.1007/s11192-006-0090-4 10.1007/s11192-006-0090-4 . BiHui , J , LiMing , L , Rousseau , R , Egghe , L 2007 The R- and AR-indices: Complementing the h-index . Chinese

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