@article{DBLP:journals/logcom/SpruitWM95,
  author    = {Paul Spruit and
               Roel Wieringa and
               John-Jules Ch. Meyer},
  title     = {Aziomatization, Declarative Semantics and Operational Semantics
               of Passive and Active Updates in Logic Databases},
  journal   = {J. Log. Comput.},
  volume    = {5},
  number    = {1},
  year      = {1995},
  pages     = {27-70},
  ee        = {http://dx.doi.org/10.1093/logcom/5.1.27},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}