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The number of scientific journals covered by ISI grew significantly between 1990 and 2000, reflecting an increase in scientific productivity and publication volume.
a product of the Institute for Scientific During the first 60-70 years of the last century it was Information (ISI, Philadelphia, USA). The number of more or less possible to read everything that was published journals covered by the ISI grew by 27% from 4464 in worldwide in whatever scientific speciality. This is no 1990 to 5684 in 2000. It is possible that these numbers longer true. De Jong and Schaper [1] published a paper on may point to a better coverage of what is published by the the number of publications in clinical cardiovascular
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Opthof et al. (2002) studied this question.
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