@inproceedings{ParTor09,
  abstract = {-},
  affiliation = {icr},
  author = {Xavier Parent and Leendert van der Torre},
  booktitle = {9th De Morgan Workshop on Deontic Logic},
  date-modified = {2011-09-25 17:55:47 +0200},
  month = dec,
  title = {Input/output logics},
  url = {http://publications.uni.lu/record/4082?ln=fr},
  year = 2009
}