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<referencetext xmlns="http://eprints.org/ep2/data/2.0">Callaham, Michael; Wears, Robert y Weber, Ellen. Journal Prestige, Publication Bias, and Other Characteristics Associated with Citation of Published Studies in Peer-Reviewed Journals. Journal of American Medical Association 2002; 287(21): 2847-2850.

Citation data: The Wrong Impact?. Nature Neuroscience 1998, 1(8): 641-642.

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LeMasters J.J. Impact factors-a good thing?. Gastroenterology 2003 Feb; 124:(2):286.

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Williams G. Misleading, unscientific, and unjust: the United Kingdom's research assessment exercise. BMJ 1998; 316: 1079-1082.</referencetext>
