Editorial, E. (1991) “Documentation. Methods for examining documents, determining their subjects, and selecting indexing terms. PNE 50-121ISO 5963-1985”, Revista Española de Documentación Científica, 14(1), pp. 57–63. Available at: https://redc.revistas.csic.es/index.php/redc/article/view/1244 (Accessed: 19May2024).