Ilkay Altintas Chad Berkley Efrat Jaeger Matthew Jones Bertram Ludäscher Steve Mock Kepler: An Extensible System for Design and Execution of Scientific Workflows. 423-424 2004 conf/ssdbm/2004 SSDBM http://csdl.computer.org/comp/proceedings/ssdbm/2004/2146/00/21460423.pdf db/conf/ssdbm/ssdbm2004.html#AltintasBJJLM04