Rehab Ayal Rawi , Muhammed Abdalhasan Shallal, Adel Ismael Jabbar. “Determination of Calcium Concentration in Different Brands of Portland Cements”. Annals of the Romanian Society for Cell Biology, May 2021, pp. 4845-56, https://www.annalsofrscb.ro/index.php/journal/article/view/5935.