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Barutu, Zeny Afriska, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (Indonesia)
Bella, Fitrisia Krisa, Jurusan Teknik Sipil, Universitas Negeri Medan (Indonesia)
Boangmanalu, Srunika, Department of Chemistry, Faculty of Mathematics and Sciences, Universias Negeri Medan, Medan 20221, Indonesia (Indonesia)
Br Sembiring, Murna Sari, Pendidikan IPA, FMIPA Universitas Negeri Medan (Indonesia)
Br. Gurusinga,, Dinda Natalisa, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Medan State University, Medan 20221, Indonesia (Indonesia)
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