Found my old research paper from 1994 "An object-oriented approach to knowledge representation in a biomedical domain". Looked like they scanned the contents of the original paper.
It's pretty outdated. Note that this was before the existence of Java or C#, but there was good old Smalltalk.
One thing is still relevant. The construction of a hybrid knowledge based system. Translated to 2007; the semantic web 3.0. Defining a clear terminological component (vocabulary) in order to make assertions from basic facts.