, Science Education Study Program, Postgraduate Program, Syiah Kuala University, Banda Aceh
, Universitas Sebelas Maret
, Science Education Program on Graduate School, Faculty of Mathematics and Natural Sciences, Yogyakarta State University (Indonesia)
Pasangka, Irvandi Gorby, Mathematics Department, Faculty of Sciences and Engineering Nusa Cendana University
Patty, Elyakim N. S.
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