Neches, Robert, Richard E. Fikes, Tim Finin, Thomas Gruber, Ramesh Patil, Ted Senator, and William R. Swartout. “Enabling Technology for Knowledge Sharing”. AI Magazine 12, no. 3 (September 15, 1991): 36. Accessed August 14, 2020. https://www.aaai.org/ojs/index.php/aimagazine/article/view/902.