http://doi.acm.org/10.1145/163090.163095 db/journals/sigmod/BreitbartDSSW93.html Yuri Breitbart Andrew Deacon Hans-Jörg Schek Amit P. Sheth Gerhard Weikum Merging Application-centric and Data-centric Approaches to Support Transaction-oriented Multi-system Workflows. 23-30 sigmodR/22-3/P023.pdf 1993 22 SIGMOD Record 3 db/journals/sigmod/sigmod22.html#BreitbartDSSW93 http://www.acm.org/sigmod/record/issues/9309/workflow.ps