TY - JOUR T1 - The Theory of Classification part 11: Adding class types to object implementations JO - Journal of Object Technology UR - https://eprints.whiterose.ac.uk/79265/ PY - 2004/01/01 AU - Simons AJH ED - DO - DOI: 10.5381/jot.2004.3.3.c1 VL - 3 IS - 3 SP - 7 EP - 19 Y2 - 2024/12/22 ER -