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Since the establishment of the Journal of Medical Case Reports in 2006, the number of journals that publish case reports has increased rapidly, and most of these journals are open access. Open access publishing usually requires authors to pay publication fees while offering the articles online, free of charge, and free of most copyright and licensing restrictions. The movement for open access h...

Previous investigations into the impact of open-access journals on subsequent citations confounded open and electronic access and failed to track availability over time. With new data, we separated these effects. We demonstrate that a journal receives a modest increase in citations when it comes online freely, but the jump is larger when it first comes online through commercial sources. This ef...

OBJECTIVE Citation analysis elucidates patterns of information consumption within professional communities. The aim of this study was to analyze the citations of 87 Spanish medical journals by calculating their impact factors and immediacy indices for 2001, and to estimate the importance of Archivos de Bronconeumología within the framework of Spanish medicine. MATERIAL AND METHOD Eighty-seven...

Two paradigmatic approaches to the normalisation of citation-impact measures are discussed. The results of the mathematical manipulation of standard indicators such as citation means, notably journal Impact Factors, (called aposteriori normalisation) are compared with citation measures obtained from fractional citation counting (called apriori normalisation). The distributions of two subfields ...

Recently, aggregated journal-journal citation networks were made accessible from the perspective of each journal included in the Science Citation Index (see http://www.leydesdorff.net/). The local matrices can be used to inspect the relevant citation environment of a journal using statistical analysis and visualization techniques from social network analysis. The inspection gives an answer to t...

BACKGROUND The impact factor (IF), as the most important criterion for journal's quality measurement, is affected by the self-citation and number of publications in each journal. OBJECTIVES To find out the relationship between the number of publications and self-citations in a journal, and their correlations with IF. MATERIALS AND METHODS Self-citations and impact factors of nine top gastro...