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Riris, Ida Duma, Chemistry Department, Faculty of Mathematics and Sciences, Medan State University, 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 Natural Science, State University of Medan (Indonesia)
Riska, Cut S, Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan, Medan 20221, Indonesia (Indonesia)
Riyanta, Aldi Budi, Politeknik Harapan Bersama, Tegal City, Central Java (Indonesia)
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