LIU, Zhijun. Research on Machine Learning-Driven Customer Churn Warning and Retention Optimization Strategy for SMEs. Financial Economics Insights , SOAP, U.K., v. 3, n. 2, p. 30–40, 2026. DOI: 10.70088/rhps4d46. Disponível em: https://soapubs.com/index.php/FEI/article/view/2101.. Acesso em: 1 jun. 2026.