Patel-Schneider, Peter F., Bernd Owsnicki-Klewe, Alfred Kobsa, Nicola Guarino, Robert MacGregor, William S. Mark, Deborah L. McGuinness, Bernhard Nebel, Albrecht Schmiedel, and John Yen. “Term Subsumption Languages in Knowledge Representation”. AI Magazine 11, no. 2 (June 15, 1990): 16. Accessed March 28, 2024. https://ojs.aaai.org/aimagazine/index.php/aimagazine/article/view/835.