Nguyen, Ngan, Tam Pham, Tu Tran, and Thanh Tran. “Applying Eco-Services in Smallholder Rubber Land Valuation”. VNUHCM Journal of Science and Technology Development 19, no. 2 (June 30, 2016): 105-112. Accessed August 10, 2025. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/674.