1. LOGIN: A logic programming language with built-in inheritance;Aı̈t-Kaci;J. Logic Program.,1986
2. Natural language processing and semantic representation of medical texts;Baud;Methods Inform. Med.,1994
3. J. Bernauer, Subsumption principles underlying medical concept systems and their formal reconstruction, in: Proc. 18th SCAMC, Am Med Informatics Assoc, 1994, pp. 140–144.
4. A logical foundation for representation of clinical data;Campbell;J. Am. Med. Inform. Assoc.,1994
5. B. Carpenter, The Logic of Typed Feature Structures, Cambridge University Press, Cambridge, 1992.