Items where Author is "Siregar, R. S. D"
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Sirait, Makmur and Sinulingga, Karya and Siregar, Nurdin and Siregar, R. S. D (2020) SYNTHESIS OF HYDROXYAPATITE FROM LIMESTONE BY USING PRECIPITATION METHOD. In: The 6th Annual International Seminar on Trends in Science and Science Education, 16-17 October 2019, North Sumatera Province, Indonesia.