GOPINATH, M. A.; DAS, P. Classification and Representation of Knowledge. Journal of Information and Knowledge, [S. l.], v. 34, n. 2, p. 85–90, 1997. DOI: 10.17821/srels/1997/v34i2/48746. Disponível em: https://srels.org/index.php/sjim/article/view/48746. Acesso em: 9 apr. 2025.