Panjaitan, Riska Thalia, Department of Chemistry, Faculty Of Mathematic and Natural Sciences, State University Of Medan (Indonesia)
Panjaitan, Teguh Hidayat, Departement of Chemistry, Faculty of Mathematics and Natural Science, Medan State University, 20221, Indonesia (Indonesia)
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)

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