Francesco Bruera Serafino Cicerone Gianlorenzo D'Angelo Gabriele Di Stefano Daniele Frigioni Dynamic Multi-level Overlay Graphs for Shortest Paths. 709-736 2008 1 Mathematics in Computer Science 4 http://dx.doi.org/10.1007/s11786-007-0023-5 db/journals/mics/mics1.html#BrueraCDSF08