@ARTICLE{Kern-Isberner02bAMAI03,
  AUTHOR = {G. Kern-Isberner},
  TITLE = {A thorough axiomatization of a principle of conditional preservation in
  belief revision}, 
  JOURNAL = {Annals of Mathematics and Artificial Intelligence},
  PUBLISHER = {Kluwer Academic Publishers},
  ADDRESS = {Dordrecht Holland},
  YEAR   = 2004    }