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Song, Ge; Li, Wenjiang . (2013). Fabrication of Hollow ZnO Particles and Its Photocatalytic Property by Modifying of Nano ZnS. Journal of Nanoscience and Nanotechnology, 13(2), 1364–1367. doi:10.1166/jnn.2013.6030 
10.1166/jnn.2013.6030