Wu, Shih-Jeh, Hsiang-Chen Hsu, and Wen-Fei Lin. “Reduction of Residual Stresses in Sapphire Cover Glass Induced by Mechanical Polishing and Laser Chamfering Through Etching”. Advances in Technology Innovation 1, no. 2 (October 1, 2016): 29-32. Accessed September 20, 2019. http://ojs.imeti.org/index.php/AITI/article/view/175.