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Pramudjono, Pramudjono and Widayati, Hermi and Ratnaningsih, Ratnaningsih and Salsabila, Ellis and Purwanto, Purwanto and Haryani, Haryani and Pujianto, Widarso and Nizar, Achmad (2012) Edumat: jurnal edukasi matematika vol. 3 no. 5 Juni 2012. Direktorat Jenderal Guru dan Tenaga Kependidikan, pp. 278-354.