@InProceedings{AGHP05a,
      AUTHOR = {Alt, Martin and Gorlatch, Sergei and Hoheisel, Andreas and Pohl, Hans-Werner},
      TITLE = {Using High Level Petri-Nets for Hierarchical Grid Workflows},
      YEAR = {2005},
      MONTH = {December},
      BOOKTITLE = {CoreGRID Integration Workshop Integrated research in Grid Computing},
      VOLUME = {TR-05-22},
      PAGES = {267-276},
      EDITOR = {Gorlatch, Sergei and Danelutto, Marco},
      ADDRESS = {Pisa, Italy},
      PUBLISHER = {Universit· di Pisa, Dipartimento di Informatica},
      URL = {http://pvs.uni-muenster.de/pvs/publikationen/},
      KEYWORDS = {WP5}
}