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Sitorus, Yonas Alexandry, Chemistry Department, Universitas Negeri Medan, Jl. Willem Iskandar, Pasar V, Medan 20221, Indonesia (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)
Solangi, Barkat Ali, Leather Research Centre, PCSIR, D-102, SITE, South avenue, Karachi. (Pakistan)
Stepanus, Jamius Bin, Engineering Faculty, Papua University, Jl Gunung Salju Amban, Manokwari, Papua Barat 98314, Indonesia
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