title: the demarcation protocol : a technique for maintaining constraints in distributed database systems daniel barbará , hector garcia-molina vldb j. 1994. authors: nan. venue: nan. year: nan
title: the ccube constraint object-oriented database system alexander brodsky , victor e. segal , jia chen , paval a. exarkhopoulo 1999. authors: nan. venue: international conference on management of data. year: nan