Grahne98'

@article{DBLP:journals/logcom/Grahne98,
  author    = {G{\"o}sta Grahne},
  title     = {Updates and Counterfactuals},
  journal   = {J. Log. Comput.},
  volume    = {8},
  number    = {1},
  year      = {1998},
  pages     = {87-117},
  ee        = {http://dx.doi.org/10.1093/logcom/8.1.87},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}