Improving Algorithm Accuracy K-Nearest Neighbor Using Z-Score Normalization and Particle Swarm Optimization to Predict Customer Churn. J. Soft Comput. Explor. [اینترنت]. 6 اکتبر 2020 [ارجاع شده 25 آگوست 2026];1(1):56-62. قابل دسترس در: https://shmpublisher.com/index.php/joscex/article/view/7