Fuat Akal Heiko Schuldt Hans-Jörg Schek Toward replication in grids for digital libraries with freshness and correctness guarantees. 1981-1993 2008 20 Concurrency and Computation: Practice and Experience 17 http://dx.doi.org/10.1002/cpe.1298 db/journals/concurrency/concurrency20.html#AkalSS08