LIU, Zhijun. Customer Retention Optimization for SMEs Using Predictive Machine Learning Models. Journal of Computer, Signal, and System Research, [S. l.], v. 3, n. 1, p. 65–74, 2026. DOI: 10.71222/5qb40t67. Disponível em: https://www.gbspress.com/index.php/JCSSR/article/view/570. Acesso em: 30 jan. 2026.