REMAWATI, DWI, et al. “Clustering of Mathematical Skill Improvement for Children With Special Needs Using K-Means Clsutering: A Case Study at Mutiara Al Islam Therapy Surakarta”. Ittishal Educational Research Journal, vol. 5, no. 2, Aug. 2024, pp. 1-16, doi:10.51425/ierj.v5i2.84.