López Alonso, Miguel Ángel. “Concept Structures for Knowledge Representation on the Internet”. Scire: knowledge representation and organization (ISSNe 2340-7042; ISSN 1135-3716) 6, no. 1 (June 1, 2000): 107–123. Accessed July 3, 2024. https://ibersid.eu/ojs/index.php/scire/article/view/1127.