Hasugian, P. M., P. B. N. Simangunsong, and S. P. Sipayung. “Development of a Local Density Optimization Approach for Structure Improvement and Cluster Separation in Water Quality Data”. Eastern-European Journal of Enterprise Technologies, vol. 5, no. 4 (137), Oct. 2025, pp. 18-30, doi:10.15587/1729-4061.2025.337049.