Improving Algorithm Accuracy K-Nearest Neighbor Using Z-Score Normalization and Particle Swarm Optimization to Predict Customer Churn. J. Soft Comput. Explor. [інтернет]. 06, Жовтень 2020 [цит. за 26, Серпень 2026];1(1):56-62. доступний у: https://shmpublisher.com/index.php/joscex/article/view/7