TY - CONF T1 - Relational concurrent refinement part II: Internal operations and outputs JO - FORMAL ASPECTS OF COMPUTING PY - 2009/02/01 AU - Boiten E AU - Derrick J AU - Schellhorn G ED - DO - DOI: 10.1007/s00165-007-0066-z VL - 21 IS - 1-2 SP - 65 EP - 102 Y2 - 2024/12/22 ER -