2025. The concentration of Mn and Fe metals in water and sediment of the Sanga-Sanga River, East Kalimantan Province. Jurnal Ilmu Perikanan Tropis Nusantara (Nusantara Tropical Fisheries Science Journal). 4, 2 (Oct. 2025), 146–153. DOI:https://doi.org/10.30872/cb0p9x16.