SORIA SANTAMARÍA, F. Cement: Administrative tender specifications and standards in Spain. Materiales de Construcción, [S. l.], v. 41, n. 221, p. 75–90, 1991. DOI: 10.3989/mc.1991.v41.i221.754. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/754. Acesso em: 2 may. 2025.