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Lua i Stíl Chicago (17ú heag.)Yulius, Yulius, H L. Salim, agus M. Ramdhan. Spatial Pattern of Bathymetry in Wangi-Wangi Island and Its Surrounding Based on GEBCO Data and Nautical Map. Universitas Muhammadiyah Surakarta, 2016.
Lua MLA (9ú heag.)Yulius, Yulius, et al. Spatial Pattern of Bathymetry in Wangi-Wangi Island and Its Surrounding Based on GEBCO Data and Nautical Map. Universitas Muhammadiyah Surakarta, 2016.
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