TY - JOUR T1 - The theory of classification part 18: Polymorphism through the looking glass JO - Journal of Object Technology UR - https://eprints.whiterose.ac.uk/79261/ PY - 2005/05/01 AU - Simons AJH ED - VL - 4 IS - 4 SP - 7 EP - 18 Y2 - 2024/12/22 ER -