Philip A. Bernstein Alan Fekete Hongfei Guo Raghu Ramakrishnan Pradeep Tamma Relaxed-currency serializability for middle-tier caching and replication. 599-610 2006 conf/sigmod/2006 SIGMOD Conference http://doi.acm.org/10.1145/1142473.1142540 db/conf/sigmod/sigmod2006.html#BernsteinFGRT06