@article{Goldbeck_1950, title={The proportioning of concrete}, url={https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2877}, DOI={10.3989/mc.1950.i011.2877}, abstractNote={<p>No disponible</p>}, number={011}, journal={Materiales de Construcción}, author={Goldbeck, A.T.}, year={1950}, month={Feb.}, pages={74–74} }