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2by Siregar, Ahmad Samin, Sukapiring, Peraturen, Tarigan, Sentosa, Sembiring, Matius Cikappen, Zulkifly, ZulkiflyGet Fulltext
Published 2001
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3by Lubis, Amir Hasan, Siregar, Ahmad Samin, Nababan, Nababan, Tanjung, Zuraida, Napitupulu, Napitupulu, Bangun, AsalGet Fulltext
Published 1978
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Academic Paper