Tian, Changan, Weitao Bao, Jihai Cheng, Qiyi Yin, Difang Zhao, Yu Wang, and Fan Wu. 2012. “Chemical Synthesis and Characterization of Ce0.8Y0.18Ca0.02O1.89 As Electrolyte for Solid Oxide Fuel Cells”. Asian Journal of Chemistry 24 (9):4028-30. https://asianpubs.org/index.php/ajchem/article/view/9534.