A. A. A. . Ashar, M. S. . Paputungan, H. Hamdhani, and I. R. Ritonga, “ANALYSIS OF Fe, Mn, AND Zn CONCENTRATIONS IN MANGROVE SEDIMENTS ALONG THE SOMBER RIVER IN BALIKPAPAN CITY”, JP, vol. 15, no. 1, pp. 387–397, Feb. 2025.