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Z. Zaenuri Universitas Negeri Semarang Indonesia
Faculty of Mathematics and Natural Sciences
S. Sudarmin Universitas Negeri Semarang Indonesia
Y. Utomo Universitas Negeri Malang Indonesia
Universitas Negeri Malang
E. Juul VIA University College, Denmark Denmark
Faculty of Education an Social Studies,
ISSN: 2089-4392
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