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Zega, Fakta Ideal, Department of Chemistry, Faculty Of Mathematics annd Natural Sciences, State University of Medan (Indonesia)
Zehra, Beena, Leather Research Centre, PCSIR, D-102, SITE, South avenue, Karachi. (Pakistan)
Zubir, Moondra, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Negeri Medan (Indonesia)
Zubir, Moondra, Universitas Negeri Medan (Indonesia)
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