@inproceedings{DBLP:conf/dagstuhl/LopezLd07,
  author    = {Fabiola L{\'o}pez y L{\'o}pez and
               Michael Luck and
               Mark d'Inverno},
  title     = {A Normative Framework for Agent-Based Systems},
  booktitle = {Normative Multi-agent Systems},
  year      = {2007},
  ee        = {http://drops.dagstuhl.de/opus/volltexte/2007/933},
  crossref  = {DBLP:conf/dagstuhl/2007P7122},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/dagstuhl/2007P7122,
  editor    = {Guido Boella and
               Leendert W. N. van der Torre and
               Harko Verhagen},
  title     = {Normative Multi-agent Systems, 18.03. - 23.03.2007},
  booktitle = {Normative Multi-agent Systems},
  publisher = {Internationales Begegnungs- und Forschungszentrum f{\"u}r
               Informatik (IBFI), Schloss Dagstuhl, Germany},
  series    = {Dagstuhl Seminar Proceedings},
  volume    = {07122},
  year      = {2007},
  ee        = {http://drops.dagstuhl.de/portals/07122/},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}