Valverde, J. L., Lobato, J., Fernández, I., Marijuán, L., Pérez-Mohedano, S., & Talero, R. (2005). Ferrous sulphate mono and heptahydrate reduction of hexavalent chromium in cement: effectiveness and storability. Materiales De Construcción, 55(279), 39–52. https://doi.org/10.3989/mc.2005.v55.i279.197