ZU, Q.; WU, T.; WANG, H. A Multi-factor Customer Classification Evaluation Model. COMPUTING AND INFORMATICS, [S. l.], v. 29, n. 4, p. 509–520, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/96. Acesso em: 3 jun. 2023.