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Riga, Riga, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padang State University (Indonesia)
Riris, Ida Duma, Chemistry Department Faculty of Mathematics and Natural Science, State University of Medan (Indonesia)
Riris, Ida Duma, Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Medan (Indonesia)
Riris, Ida Duma, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, Medan (Indonesia)
Riska, Cut S, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
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