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Sitorus, Yonas Alexandry, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (Indonesia)
Situmeang, Juwita Cristina, Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Situmorang, Imelda, Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Negeri Medan (Indonesia)
Sofiyanita, Sofiyanita, Universitas Islam Negeri Sultan Syarif Kasim Riau Pekanbaru (Indonesia)
Sofiyanita, Sofiyanita, Chemical Education of the State Islamic University Sultan Syarif Kasim Riau (Indonesia)
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