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and uses averages on the assumption of the Central Limit Theorem (Glänzel 2010 ). However, citation distributions are extremely skewed (Seglen 1992 , 1997 ; cf. Leydesdorff 2008 ) and central tendency statistics give misleading results. Using
. , & Clark , J. ( 2003 ). Successful students’ conceptions of mean, standard deviation, and the Central Limit Theorem (Unpublished paper). Retrieved from http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.446.6077&rep=rep1&type