Pasaribu, Desti S.N, Department of Chemistry- Faculty of Mathematics and Natural Sciences Universitas Negeri Medan
Pasaribu, Nur Rizky, Department of Chemisty, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Padang 25132, INDONESIA. (Indonesia)
Pervez, Mohammad Kashif, Leather Research Centre, PCSIR, D-102, SITE, South avenue, Karachi. (Pakistan)
PN, Chyntya Angelina, Chemistry Department, Faculty of Mathematics and Natural Science, Universitas Negeri Medan (Indonesia)
Pratiwi, Alfira Julian, Department of Chemistry, Faculty of Mathematics and Science, Universitas Negeri Medan, Medan (Indonesia)

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