Stoll U, Streed E. Use of a flame photometer for estimating the cement contenta of soil-cement and pozzolan-cement mixtures. Mater. constr. [Internet]. 1954Jan.30 [cited 2024Jul.23];4(047):3-. Available from: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2541