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Juliani, Rita and Situmorang, Rappel and Lumbanraja, Wanri (2011) POLA PENENTUAN PARAMETER KERUSAKAN TERUMBU KARANG DI DAERAH SIBOLGA. Research Report. FMIPA Unimed.
Rahmatsyah, and Marlianto, Eddy and Sitepu, Mester and Motlan, (2015) ANALYSIS OF THE PORITES CORAL REEF GROWTH BASED ON NATURAL CAUSES IN CENTRAL TAPANULI SUB REGION, NORTH SUMATRA INDONESIA. International Journal of Sciences : Basic and Applied Research (IJSBAR), 22 (05). ISSN 2307-4531