Amalia, H. S., U. Athiyah, and A. W. Muhammad. “The Application of Modified K-Nearest Neighbor Algorithm for Classification of Groundwater Quality Based on Image Processing and PH, TDS, and Temperature Sensors”. Register, vol. 9, no. 1, Mar. 2023, pp. 42-54, doi:10.26594/register.v9i1.2827.