This graph contains citations taken from the Web of Science database for the above-mentioned journals. There are two sliders. One controls the threshold of citations that will be One controls the threshold of citations that will be displayed (lower number equals more nodes on the graph). The other controls the years covered. The data is divided into four decades from 1973-present. Because of the limits of the Web of Science coverage, the first decade (1973-1982) contains considerably fewer citations than the others. Please wait until the graph stops moving before scrolling your browser or the citation threshold. For more information on this was constructed, see here and here.