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Odja, O, Universitas Negeri Gorontalo, Indonesia
Oktaviara, A., Program Studi Pendidikan Fisika, Fakultas Sains dan Matematika, Universitas Kristen Satya Wacana (Indonesia)
Oktova, Raden, Physics Education Study Program,
Universitas Ahmad Dahlan, Indonesia
Ozkan, G., Yildiz Technical University, Turkey (Turkey)
