Didier Bert Jonathan P. Bowen Martin C. Henson Ken Robinson ZB 2002: Formal Specification and Development in Z and B, 2nd International Conference of B and Z Users, Grenoble, France, January 23-25, 2002, Proceedings ZB Lecture Notes in Computer Science 2272 Springer 2002 3-540-43166-7 db/conf/zum/zb2002.html