SLABBEKOORN, KRISTIAN, TOMOYA NORO, and TAKEHIRO TOKUDA. “ONTOLOGY-ASSISTED DISCOVERY OF HIERARCHICAL TOPIC CLUSTERS ON THE SOCIAL WEB”. Journal of Web Engineering 15, no. 5-6 (March 20, 2016): 361–396. Accessed May 1, 2024. https://journals.riverpublishers.com/index.php/JWE/article/view/3795.