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Al-Ghamdi, A. A., Mahmoud, W. E., Yaghmour, S. J., & Al-Marzouki, F. M. (2009). Structure and optical properties of nanocrystalline NiO thin film synthesized by sol–gel spin-coating method. Journal of Alloys and Compounds, 486(1-2), 9–13. doi:10.1016/j.jallcom.2009.06.139 
10.1016/j.jallcom.2009.06.139