D. REMAWATI, K. Sandradewi, T. Irawati, and S. H. Fitriasih, “Clustering of Mathematical Skill Improvement for Children with Special Needs Using K-Means Clsutering: A Case Study at Mutiara Al Islam Therapy Surakarta”, IERJ, vol. 5, no. 2, pp. 1-16, Aug. 2024.