Christoph Beierle Gabriele Kern-Isberner Modelling Conditional Knowledge Discovery and Belief Revision by Abstract State Machines. 186-203 2003 conf/asm/2003 Abstract State Machines http://link.springer.de/link/service/series/0558/bibs/2589/25890186.htm db/conf/asm/asm2003.html#BeierleK03