Tarkowski, M., P. Szczepański, T. Rahwan, T. Michalak, and M. Wooldridge. “Closeness Centrality for Networks With Overlapping Community Structure”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 30, no. 1, Feb. 2016, doi:10.1609/aaai.v30i1.10034.