CALLEJA, J. Present state of research on concrete additives in Spain (lETcc). Materiales de Construcción, [S. l.], v. 19, n. 136, p. 41–58, 1969. DOI: 10.3989/mc.1969.v19.i136.1576. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1576. Acesso em: 3 may. 2024.