ZUNHUAN, S.; YUNING, Y.; JIANCHENG, L. Research on Regional Ecological Efficiency Based on AQI Index. The International Journal of Business & Management, [S. l.], v. 6, n. 8, 2018. Disponível em: http://www.internationaljournalcorner.com/index.php/theijbm/article/view/131868. Acesso em: 19 may. 2024.