Wang*, X.B., J. Liu, Z.D. Xu, and J. Li. “A Facile Route to Prepare Hollow SiO2 Spheres Decorated With NiO Nanoparticles”. Asian Journal of Chemistry 23, no. 5 (January 31, 2011): 2335–2338. Accessed June 30, 2024. https://asianpubs.org/index.php/ajchem/article/view/10385.