A Facile Preparation Method of ZrO2 Hollow Sphere Using PVA Microcapsule as a TemplateDong-Hee Lee, Seon-Geun Lee, Jae-Chun Ryu and Young-Ho KimMATEC Web Conf., 67 (2016) 02012DOI: https://doi.org/10.1051/matecconf/20166702012