Yonit Kesten Amir Pnueli Elad Shahar Lenore D. Zuck Network Invariants in Action. 101-115 2002 conf/concur/2002 CONCUR http://link.springer.de/link/service/series/0558/bibs/2421/24210101.htm db/conf/concur/concur2002.html#KestenPSZ02