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K. Abass, , A. and A. Abd Al-Hassan , S. 2019. Effect the Composition Ratio of Cobalt Oxide on the Structural and Optical Properties of Tin Oxide. Al-Qadisiyah Journal of Pure Science. 24, 3 (Nov. 2019). DOI:https://doi.org/10.29350/jops.2019.24.3.968.