E. Bergamini, M. Borassi, P. Crescenzi, A. Marino, and H. Meyerhenke. {C}omputing {T}op-k {C}loseness {C}entrality {F}aster in {U}nweighted {G}raphs. Proceedings of the Eighteenth Workshop on Algorithm Engineering and Experiments, ALENEX 2016, Arlington, Virginia, USA, January 10, 2016, 2016.