Li, Wei, Shaohua Zheng, Shiyu Ma, Haiyang Ding, Da Jiao, and Bingqiang Cao. 2010. “Study of Surface Modification of ZrO2 SiO2 Nanocomposites With Aluminum Zirconium Coupling Agent”. Asian Journal of Chemistry 23 (2):705-8. https://asianpubs.org/index.php/ajchem/article/view/15825.