GOPINATH, M. A. Classification Systems for Digital Era. Journal of Information and Knowledge, [S. l.], v. 38, n. 1, p. 3–8, 2001. DOI: 10.17821/srels/2001/v38i1/48945. Disponível em: https://srels.org/index.php/sjim/article/view/48945. Acesso em: 8 jan. 2025.