Nguyen, Bao-An, and Don-Lin Yang. “A Semi-Automatic Approach to Construct Vietnamese Ontology from Online Text”. The International Review of Research in Open and Distributed Learning 13, no. 5 (November 15, 2012): 148–172. Accessed March 28, 2024. https://www.irrodl.org/index.php/irrodl/article/view/1250.