GUPTA, B. S. S. Preparation of Feature Heading and Class Index Heading Using Computer. Journal of Information and Knowledge, [S. l.], v. 7, n. 4, p. 373–381, 1970. DOI: 10.17821/srels/1970/v7i4/54491. Disponível em: https://srels.org/index.php/sjim/article/view/54491. Acesso em: 8 jan. 2025.