WALZ, K. Relation between the water-cement ratio, the normalised strength of concrete (DIN 1164, June 1970) and concrete strength under compression. Materiales de Construcción, [S. l.], v. 21, n. 143, p. 45–55, 1971. DOI: 10.3989/mc.1971.v21.i143.1502. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1502. Acesso em: 4 may. 2024.