Kim, Sung-Min, Soo-Chul Park, and Hyo-Jung Seol. 2019. “Effect of Additional Heat Treatment of a Pd-Au-Ag Metal-Ceramic Alloy on Hardness Change During Simulated Porcelain Firing”. International Journal of Engineering & Technology 8 (1.4): 183-90. https://doi.org/10.14419/ijet.v8i1.4.25145.