“The Concentration of Mn and Fe Metals in Water and Sediment of the Sanga-Sanga River, East Kalimantan Province”. 2025. Jurnal Ilmu Perikanan Tropis Nusantara (Nusantara Tropical Fisheries Science Journal) 4 (2): 146-53. https://doi.org/10.30872/cb0p9x16.