KELLY, J.; POLIVKA, M. Ball test for field control of concrete consistency. Materiales de Construcción, [S. l.], v. 5, n. 067, p. 31–34, 1955. DOI: 10.3989/mc.1955.v05.i067.2536. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2536. Acesso em: 13 may. 2024.