Trio: A System for Data, Uncertainty, and Lineage. - Parag Agrawal; Omar Benjelloun; Anish Das Sarma; Chris Hayworth; Shubha U. Nabar; Tomoe Sugihara; Jennifer Widom (VLDB, 2006)

An Introduction to ULDBs and the Trio System. - Omar Benjelloun; Anish Das Sarma; Chris Hayworth; Jennifer Widom (IEEE Data Eng. Bull., 2006)