@InProceedings{hoffmann:ecai-02,
  crossref =  "ecai02",
  author =     "J{\"o}rg Hoffmann",
  title =        "Extending {FF} to Numerical State Variables",
  pages = "571-575"
}


@Proceedings{ecai02,
  key =         "ECAI-02",
  OPTeditor =      "F. Van Harmelen",
  title = 	"Proceedings of the 15th European Conference on Artificial
                  Intelligence (ECAI-02)",
  booktitle = 	"Proceedings of the 15th European Conference on Artificial
                  Intelligence (ECAI-02)",
  year = 	2002,
  publisher = 	wil,
  address = 	"Lyon, France",
  month = 	Jul,
}