TY - CONF T1 - Formal program development with approximations JO - ZB 2005: FORMAL SPECIFICATION AND DEVELOPMENT IN Z AND B, PROCEEDINGS PY - 2005/01/01 AU - Boiten EA AU - Derrick J ED - Treharne H ED - King S ED - Henson M ED - Schneider S VL - 3455 SP - 374 EP - 392 Y2 - 2024/10/23 ER -