Ben Clifford Ian T. Foster Jens-S. Vöckler Michael Wilde Yong Zhao Tracking provenance in a virtual data grid. 565-575 2008 20 Concurrency and Computation: Practice and Experience 5 http://dx.doi.org/10.1002/cpe.1256 db/journals/concurrency/concurrency20.html#CliffordFVWZ08