RANGANATHAN, S. R.; NEELAMEGHAN, A. Universal Classification System and FID. Journal of Information and Knowledge, [S. l.], v. 8, n. 2, p. 97–108, 2000. DOI: 10.17821/srels/1971/v8i2/49166. Disponível em: https://srels.org/index.php/sjim/article/view/49166. Acesso em: 8 jan. 2025.