@article{makinson2000input,
  title = {Input/output logics},
  author = {Makinson, D. and Van Der Torre, L.},
  journal = {Journal of Philosophical Logic},
  volume = {29},
  number = {4},
  pages = {383--408},
  year = {2000},
  publisher = {Springer},
  url = {http://icr.uni.lu/leonvandertorre/papers/jpl00.pdf}
}