Luca Dall'Asta J. Ignacio Alvarez-Hamelin Alain Barrat Alexei Vázquez Alessandro Vespignani Exploring networks with traceroute-like probes: theory and simulations http://arxiv.org/abs/cs/0412007 2004 CoRR abs/cs/0412007 db/journals/corr/corr0412.html#abs-cs-0412007 informal publication