TY - JOUR T1 - The theory of classification part 1: Perspectives on type compatibility JO - Journal of Object Technology UR - https://eprints.whiterose.ac.uk/79275/ PY - 2002/01/01 AU - Simons AJH ED - DO - DOI: 10.5381/jot.2002.1.1.c5 VL - 1 IS - 1 SP - 55 EP - 61 Y2 - 2025/06/26 ER -