@InCollection{SakZhaTsiDik07,
      AUTHOR = {Sakellariou, Rizos and Zhao, Henan and Tsiakkouri, Eleni and Dikaiakos, Marios},
      TITLE = {Scheduling Workflows with Budget Constraints},
      YEAR = {2007},
      BOOKTITLE = {Integrated Research in GRID Computing},
      PAGES = {189-202},
      EDITOR = {Gorlatch, Sergei and Danelutto, Marco},
      SERIES = {CoreGRID},
      PUBLISHER = {Springer-Verlag},
      URL = {http://www.cs.man.ac.uk/~rizos/papers/coregrid2005a.pdf},
      KEYWORDS = {WP4, WP6}
}