Tobias Heer Shaohui Li Klaus Wehrle PISA: P2P Wi-Fi Internet Sharing Architecture. 251-252 2007 Peer-to-Peer Computing http://doi.ieeecomputersociety.org/10.1109/P2P.2007.30 conf/p2p/2007 db/conf/p2p/p2p2007.html#HeerLW07