@InProceedings{UpdateSemanticsNlis98,
  Title                    = {An Update Semantics for Deontic Reasoning},
  Author                   = {Torre, L.W.N. van der, and Tan, Y.-H.},
  Booktitle                = {International Workshop on Natural Language and Information Systems NLIS'98},
  Year                     = {1998},

  Url                      = {http://icr.uni.lu/leonvandertorre/papers/nlis98.ps.Z}
}