Mark Lillibridge Sameh Elnikety Andrew Birrell Michael Burrows Michael Isard A Cooperative Internet Backup Scheme. 29-41 2003 conf/usenix/2003g USENIX Annual Technical Conference, General Track http://www.usenix.org/events/usenix03/tech/lillibridge.html db/conf/usenix/usenix2003g.html#LillibridgeEBBI03