SHERGELD, F. The percentage voids in compactedd gravel as a measure of its angularity. Materiales de Construcción, [S. l.], v. 4, n. 049, p. 44–45, 1954. DOI: 10.3989/mc.1954.v04.i049.2560. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2560. Acesso em: 17 may. 2024.