Fig. 7From: Fractal dimension analogous scale-invariant derivative of Hirsch’s indexArtificially constructed two acyclic directed graphs with the same number of vertices and different \(h_d\) values. The graphs are built by adding a vertex repeatedly, just like the real-life complex network. The older vertex in red, then yellow, green, and the new one in blue, and the vertex size is proportional to its in-degree. The other layout configurations are identical to Fig. 1Back to article page