Hai, Pham Hoang, Nguyen An Thinh, Nguyen Thu Nhung, Hoang Bac, and Tran Thi Mai Phuong. 2014. “Ecological Economic Systems: Concepts and Research Experiences (a Proposed Application for the Central Highland Region)”. Vietnam Journal of Earth Sciences 35 (4):327-35. https://doi.org/10.15625/0866-7187/35/4/4116.