Bich Hue, Duong, and Nguyen Ngoc An. “RESEARCH ON ENVIRONMENTAL ACTUALITY BY BIOLOGICAL RESOURCES EXPLOITATION AT DUC PHO DISTRICT, QUANG NGAI PROVINCE”. Science and Technology Development Journal 8, no. 2 (February 28, 2005): 50-58. Accessed May 13, 2024. http://stdj.scienceandtechnology.com.vn/index.php/stdj/article/view/2971.