Lusiana, E., A. Darmawan, S. Hutahaean, M. Musa, M. Mahmudi, and S. Arsad. “Factors Affecting Dissolved Oxygen at Bengawan Solo River: A Spatial Filtering With Eigenvector Technique”. Jurnal Varian, Vol. 5, no. 1, Nov. 2021, pp. 1 - 8, doi:https://doi.org/10.30812/varian.v5i1.1407.