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Gottlieb, Esther E., The Ohio State University (United States)
Gregorutti, Gustavo, University of Montemorelos (Mexico)
Gultom, Parapat, University of North Sumatra (Indonesia)
Gunarhadi, ,, Sebelas Maret University (Indonesia)
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ISSN 2153-9669 (print) 2153-9677 (online)