Fig. 3From: Internal dynamics of patent reference networks using the Bray–Curtis dissimilarity measureIn-degree-distribution of the categories (nodes) for all the eight quarter-years (q1-q8). Only those edges were considered, which represent (a) exactly one citation; (b) exactly five citations. The dotted lines represent the (a) Poisson- (b) exponential distribution, each with a mean-representing parameter that was estimated by the average of the respective datasetBack to article page