@article{article, title  = {{The Theory of Classification part 20: Modular checking of classtypes}},

 url = {{}},

 year = {{2005}},

 month = {{1}},

 author = {{Simons AJH}},

 doi = {{10.5381/jot.2005.4.7.c1}},

 volume = {{4}},

 journal = {{Journal of Object Technology}},

 issue = {{7}},

 pages = {{7-18}},

 note = {{Accessed on 2025/11/29}}}