title: rainbow : distributed database system for classroom education and experimental research. authors: abdelsalam helal , hua li. venue: vldb. year: 2000
title: the demarcation protocol : a technique for maintaining constraints in distributed database systems. authors: daniel barbar &#225; - mill &#225; , hector garcia-molina. venue: the vldb journal -- the international journal on very large data bases. year: 1994