Bernal, J.L., del Nozal, J., Deban, L., Tascón, M.L. and Sánchez Cerrato, Ángel 1988. Determination of sulphides in cements by using potentiometry with a selective electrode of sulphides. Materiales de Construcción. 38, 209 (Mar. 1988), 5–12. DOI:https://doi.org/10.3989/mc.1988.v38.i209.844.