Zahran, Muhammad Ali Athiya, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Zakwan, Zakwan, cProgram Studi Teknologi Pengolahan Hasil Perkebunan, STIPER Agrobisnis Perkebunan Medan
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, Departement of Chemistry, Faculty of Mathematics and Natural Science, Medan State University, 20221, Indonesia (Indonesia)

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