BONZEL, J. Technological principles of the new German Concrete Standards. Materiales de Construcción, [S. l.], v. 22, n. 145, p. 57–81, 1972. DOI: 10.3989/mc.1972.v22.i145.1439. Disponível em: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/1439. Acesso em: 28 apr. 2024.