W. L. T. Tobing, M. . Magdalena Kolo, D. . Bria, M. . Putra Purba, and E. . Maria Paulo Soares, “Soil Characterization In Ex-Manganese Mining Land In North-Central Timor District, East Nusa Tenggara”, IJSTM, vol. 3, no. 6, pp. 1753–1762, Nov. 2022.