Improving Algorithm Accuracy K-Nearest Neighbor Using Z-Score Normalization and Particle Swarm Optimization to Predict Customer Churn. J. Soft Comput. Explor. [انترنت]. 6 أكتوبر، 2020 [وثق 25 أغسطس، 2026];1(1):56-62. موجود في: https://shmpublisher.com/index.php/joscex/article/view/7