@article{article, title  = {{The theory of classification part 4: Object types and subtyping}},

 url = {{https://eprints.whiterose.ac.uk/79278/ }},

 year = {{2002}},

 month = {{1}},

 author = {{Simons AJH}},

 doi = {{10.5381/jot.2002.1.5.c2}},

 volume = {{1}},

 journal = {{Journal of Object Technology}},

 issue = {{5}},

 pages = {{27-33}},

 note = {{Accessed on 2024/10/23}}}