Susan B. Davidson Sarah Cohen Boulakia Anat Eyal Bertram Ludäscher Timothy M. McPhillips Shawn Bowers Manish Kumar Anand Juliana Freire Provenance in Scientific Workflow Systems. 44-50 2007 30 IEEE Data Eng. Bull. 4 http://sites.computer.org/debull/A07dec/susan.pdf db/journals/debu/debu30.html#DavidsonBELMBAF07