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One of the most critical operations performed in a P2P system is the lookup of a resource. The main issues to be addressed by lookup algorithms are: (1) support for flexible search criteria (e.g., wildcard or multi-keyword searches), (2) effectiveness -i.e., ability to identify all the resources that match the search criteria, (3) efficiency -i.e. low overhead, (4) robustness with respect to node failures and churning. Flood-based P2P networks provide flexible lookup facilities and robustdoi:10.1109/ipdps.2009.5160900 dblp:conf/ipps/AndreoliniL09 fatcat:bu3lycrrn5ca7aqboartkwpbku