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6nork S, Sartono, Hadiwisastra, Sapri, W, Soekahardjo, Glinka, Yosef, Nurhadi, Nurhadi, Rangkuti, NurhadiGet Fulltext
Argitaratua 1987
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9nork Simanjuntak, Harry Truman, Rangkuti, Nurhadi, Susetyo, Sukawati, Djafar, Hasan, Wibisono, Sonny CGet Fulltext
Argitaratua 2014
Academic Paper