This factor is obtained by counting the citation of a given paper in a scientific journal within 2 or 5 years; thus, there are two factors, which can be obtained for each journal in a given scientific field (e.g., parasitology). Impact factors of course increase considerably, if in a given scientific field many journals are listed. Furthermore reviews are more often cited than original articles. This can be seen in the list of the top 20 journals (out of 35) in the field of Parasitology (obtained in 2013):
Top 20 journals in the category Parasitology (out of 35) are presented in Table 1.
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Mehlhorn, H. (2016). Impact Factor. In: Mehlhorn, H. (eds) Encyclopedia of Parasitology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-43978-4_4703
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