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.1177/000312240707200403 . Leimu , R , Koricheva , J 2005 What determines the citation frequency of ecological papers? . Trends in Ecology & Evolution 20 1 28 – 32 10.1016/j.tree.2004.10.010 . Leta , J , Lewison , G 2003

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Journal of Economics 36 : 16 – 38 . Harhoff , D , Narin , F , Scherer , FM , Vopel , K 1999 Citation frequency and the value of patented inventions . The Review of Economics and Statistics 81

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1999 Citation frequency and the value of patented inventions . The Review of Economics and Statistics, 81 3 : 511 – 515 10.1162/003465399558265 . Henderson , R. , & Cockburn , I. ( 1993 ). Scale

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documents, assuming that two documents are similar if they are cited together (Small 1973 ). Degree of similarity can accordingly be measured as the number of times two documents are cited together (their co-citation frequency). Co-citations are often used

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Scientist 4 : 488 – 493 . Garfield , E 1989 Delayed recognition in scientific discovery: Citation frequency analysis aids the search for case histories . Essays of an Information

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