@incollection{DiNoGeoLet:99,
  volume = {15},
  title = {Conditional states in finite-valued logics},
  year = {1999},
  booktitle = {Fuzzy sets, logics and reasoning about knowledge},
  pages = {161--174},
  publisher = {Kluwer Acad. Publ.},
  address = {Dordrecht},
  author = {Di Nola, Antonio and Georgescu, George and Lettieri, Ada},
  series = {Appl. Log. Ser.},
}