Shehab, Alia A., Saad B. Farid, and Hanan K. Hassun. 2017. “Modeling of The Effect of Grain Size and La2O3 Doping on Sintering α – Cristobilite”. Ibn AL-Haitham Journal For Pure and Applied Sciences 26 (2): 112-19. https://jih.uobaghdad.edu.iq/index.php/j/article/view/490.