Živanović, B. M., L. Petrašinović, T. Milovanović, L. Karanović, and I. Krstanović. “Influence of Ba2+ and Sr2+ Ions on the Hydration Process of Portland Cement and Blended Cements”. Materiales De Construcción, vol. 37, no. 208, Dec. 1987, pp. 5-12, doi:10.3989/mc.1987.v37.i208.852.