Roza, Destria, Chemistry Department Faculty of Mathematics and Natural Science, State University of Medan (Indonesia)
Roza, Destria, Department of Chemistry, Faculty of Mathematics and Natural Sciences, State University of medan, Jl. Williem Iskandar Pasar V Medan Estate, Medan 20221, Indonesia (Indonesia)
Rusdiarso, Bambang, Departemen Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Gadjah Mada (Indonesia)
Rusiana, Della Ayu, Politeknik Harapan Bersama, Jl. Mataram No. 9, Kel. Pesurungan Lor, Margadana, Tegal City, (Indonesia)

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