@unpublished{HuellenWeberskirch1999,
  author  = {Jochem H{\"u}llen and Frank Weberskirch},
  title   = {Extracting Goal Orderings to Improve Partial-Order Planning},
  institution = {Fachbereich Informatik},
  year    = {1999},
  url  = {http://nbn-resolving.de/urn:nbn:de:hbz:386-kluedo-682},
}