@article{DBLP:journals/japll/BoellaGHRRT11,
  author = {Guido Boella and
               Guido Governatori and
               Joris Hulstijn and
               R{\'e}gis Riveret and
               Antonino Rotolo and
               Leendert van der Torre},
  title = {Time and defeasibility in FIPA ACL semantics},
  journal = {J. Applied Logic},
  volume = {9},
  number = {4},
  year = {2011},
  pages = {274-288},
  ee = {http://dx.doi.org/10.1016/j.jal.2011.09.006},
  bibsource = {DBLP, http://dblp.uni-trier.de},
  url = {http://icr.uni.lu/leonvandertorre/papers/timeanddefeasibility.pdf}
}