A Abdulla, Mohammed, Nadira A. Hatim, and Isam K. Al-Khayat. 2009. “Modification of Gypsum Products (Part II): The Effect of Drying Methods on The Compressive Strength and Surface Hardness of Modified Gypsum Products”. Al-Rafidain Dental Journal 9 (2):162-67. https://doi.org/10.33899/rden.2009.9107.