Rescaled probability distributions of citation for academic journals for different years.

<p>Probability distribution <i>P</i>(<i>c</i>) of citations <i>c</i> rescaled by average number of citations 〈<i>c</i>〉 to publications from from 4 different years (1980, 1990, 2000, 2010) for several academic journal. For any journal, the data for different years seem to follow the same distribution.