Saad, A., Saleh, A. B. A., Al-Kadri, F. A., Babaqi, A. S., Basissa, A. A., & El-Enein, S. A. (2008). Studies of Surface Area and Pore Structure on Portland Cement Produced in Bajil and Amran, Yemen. Sultan Qaboos University Journal for Science, 13, 13. https://doi.org/10.24200/squjs.vol13iss0pp13-25