SMITH, E. .; WHIFFIN, A. . Density measurements of concrete slabs using gamma radiation. Materiales de Construcción, [S. l.], v. 4, n. 047, p. 38–38, 1954. DOI: 10.3989/mc.1954.v04.i047.2547. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2547. Acesso em: 17 may. 2024.